diff --git a/filenames.gni b/filenames.gni
index f244a471bcaf..fc03b63bb300 100644
--- a/filenames.gni
+++ b/filenames.gni
@@ -476,7 +476,6 @@ filenames = {
     "shell/common/gin_converters/gurl_converter.h",
     "shell/common/gin_converters/image_converter.cc",
     "shell/common/gin_converters/image_converter.h",
-    "shell/common/gin_converters/native_mate_handle_converter.h",
     "shell/common/gin_converters/message_box_converter.cc",
     "shell/common/gin_converters/message_box_converter.h",
     "shell/common/gin_converters/native_window_converter.h",
diff --git a/native_mate/BUILD.gn b/native_mate/BUILD.gn
index c89ce890000c..26dde6b20efb 100644
--- a/native_mate/BUILD.gn
+++ b/native_mate/BUILD.gn
@@ -10,6 +10,7 @@ source_set("native_mate") {
     "//v8:v8_headers",
   ]
   public_configs = [ ":native_mate_config" ]
+  include_dirs = [ ".." ]
   sources = [
     "native_mate/arguments.cc",
     "native_mate/arguments.h",
diff --git a/native_mate/native_mate/constructor.h b/native_mate/native_mate/constructor.h
index 8152df152e88..438bbf500467 100644
--- a/native_mate/native_mate/constructor.h
+++ b/native_mate/native_mate/constructor.h
@@ -11,6 +11,7 @@
 
 #include "base/bind.h"
 #include "native_mate/function_template.h"
+#include "shell/common/gin_helper/function_template.h"
 
 namespace mate {
 
@@ -30,7 +31,8 @@ inline WrappableBase* InvokeFactory(
     Arguments* args,
     const base::Callback<WrappableBase*(P1)>& callback) {
   typename CallbackParamTraits<P1>::LocalType a1;
-  if (!GetNextArgument(args, 0, true, &a1))
+  gin::Arguments gin_args(args->info());
+  if (!gin_helper::GetNextArgument(&gin_args, 0, true, &a1))
     return nullptr;
   return callback.Run(a1);
 }
@@ -41,8 +43,9 @@ inline WrappableBase* InvokeFactory(
     const base::Callback<WrappableBase*(P1, P2)>& callback) {
   typename CallbackParamTraits<P1>::LocalType a1;
   typename CallbackParamTraits<P2>::LocalType a2;
-  if (!GetNextArgument(args, 0, true, &a1) ||
-      !GetNextArgument(args, 0, false, &a2))
+  gin::Arguments gin_args(args->info());
+  if (!gin_helper::GetNextArgument(&gin_args, 0, true, &a1) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a2))
     return nullptr;
   return callback.Run(a1, a2);
 }
@@ -54,9 +57,10 @@ inline WrappableBase* InvokeFactory(
   typename CallbackParamTraits<P1>::LocalType a1;
   typename CallbackParamTraits<P2>::LocalType a2;
   typename CallbackParamTraits<P3>::LocalType a3;
-  if (!GetNextArgument(args, 0, true, &a1) ||
-      !GetNextArgument(args, 0, false, &a2) ||
-      !GetNextArgument(args, 0, false, &a3))
+  gin::Arguments gin_args(args->info());
+  if (!gin_helper::GetNextArgument(&gin_args, 0, true, &a1) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a2) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a3))
     return nullptr;
   return callback.Run(a1, a2, a3);
 }
@@ -69,10 +73,11 @@ inline WrappableBase* InvokeFactory(
   typename CallbackParamTraits<P2>::LocalType a2;
   typename CallbackParamTraits<P3>::LocalType a3;
   typename CallbackParamTraits<P4>::LocalType a4;
-  if (!GetNextArgument(args, 0, true, &a1) ||
-      !GetNextArgument(args, 0, false, &a2) ||
-      !GetNextArgument(args, 0, false, &a3) ||
-      !GetNextArgument(args, 0, false, &a4))
+  gin::Arguments gin_args(args->info());
+  if (!gin_helper::GetNextArgument(&gin_args, 0, true, &a1) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a2) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a3) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a4))
     return nullptr;
   return callback.Run(a1, a2, a3, a4);
 }
@@ -86,11 +91,12 @@ inline WrappableBase* InvokeFactory(
   typename CallbackParamTraits<P3>::LocalType a3;
   typename CallbackParamTraits<P4>::LocalType a4;
   typename CallbackParamTraits<P5>::LocalType a5;
-  if (!GetNextArgument(args, 0, true, &a1) ||
-      !GetNextArgument(args, 0, false, &a2) ||
-      !GetNextArgument(args, 0, false, &a3) ||
-      !GetNextArgument(args, 0, false, &a4) ||
-      !GetNextArgument(args, 0, false, &a5))
+  gin::Arguments gin_args(args->info());
+  if (!gin_helper::GetNextArgument(&gin_args, 0, true, &a1) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a2) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a3) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a4) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a5))
     return nullptr;
   return callback.Run(a1, a2, a3, a4, a5);
 }
@@ -110,12 +116,13 @@ inline WrappableBase* InvokeFactory(
   typename CallbackParamTraits<P4>::LocalType a4;
   typename CallbackParamTraits<P5>::LocalType a5;
   typename CallbackParamTraits<P6>::LocalType a6;
-  if (!GetNextArgument(args, 0, true, &a1) ||
-      !GetNextArgument(args, 0, false, &a2) ||
-      !GetNextArgument(args, 0, false, &a3) ||
-      !GetNextArgument(args, 0, false, &a4) ||
-      !GetNextArgument(args, 0, false, &a5) ||
-      !GetNextArgument(args, 0, false, &a6))
+  gin::Arguments gin_args(args->info());
+  if (!gin_helper::GetNextArgument(&gin_args, 0, true, &a1) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a2) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a3) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a4) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a5) ||
+      !gin_helper::GetNextArgument(&gin_args, 0, false, &a6))
     return nullptr;
   return callback.Run(a1, a2, a3, a4, a5, a6);
 }
diff --git a/native_mate/native_mate/dictionary.h b/native_mate/native_mate/dictionary.h
index 9bfc0d55b067..412acd25a958 100644
--- a/native_mate/native_mate/dictionary.h
+++ b/native_mate/native_mate/dictionary.h
@@ -115,4 +115,22 @@ struct Converter<Dictionary> {
 
 }  // namespace mate
 
+namespace gin {
+
+// Keep compatibility with gin.
+template <>
+struct Converter<mate::Dictionary> {
+  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
+                                   const mate::Dictionary& in) {
+    return mate::ConvertToV8(isolate, in);
+  }
+  static bool FromV8(v8::Isolate* isolate,
+                     v8::Local<v8::Value> val,
+                     mate::Dictionary* out) {
+    return mate::ConvertFromV8(isolate, val, out);
+  }
+};
+
+}  // namespace gin
+
 #endif  // NATIVE_MATE_NATIVE_MATE_DICTIONARY_H_
diff --git a/native_mate/native_mate/function_template.h b/native_mate/native_mate/function_template.h
index 47ebfd3d2b0c..babba9506308 100644
--- a/native_mate/native_mate/function_template.h
+++ b/native_mate/native_mate/function_template.h
@@ -5,11 +5,11 @@
 #ifndef NATIVE_MATE_NATIVE_MATE_FUNCTION_TEMPLATE_H_
 #define NATIVE_MATE_NATIVE_MATE_FUNCTION_TEMPLATE_H_
 
-#include "../shell/common/gin_helper/destroyable.h"
-#include "../shell/common/gin_helper/error_thrower.h"
 #include "base/callback.h"
 #include "native_mate/arguments.h"
 #include "native_mate/wrappable_base.h"
+#include "shell/common/gin_helper/destroyable.h"
+#include "shell/common/gin_helper/error_thrower.h"
 
 // =============================== NOTICE ===============================
 // Do not add code here, native_mate is being removed. Any new code
diff --git a/native_mate/native_mate/handle.h b/native_mate/native_mate/handle.h
index 793d722234fd..12e411434a7e 100644
--- a/native_mate/native_mate/handle.h
+++ b/native_mate/native_mate/handle.h
@@ -69,4 +69,22 @@ mate::Handle<T> CreateHandle(v8::Isolate* isolate, T* object) {
 
 }  // namespace mate
 
+namespace gin {
+
+// Keep compatibility with gin.
+template <typename T>
+struct Converter<mate::Handle<T>> {
+  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
+                                   const mate::Handle<T>& in) {
+    return mate::ConvertToV8(isolate, in);
+  }
+  static bool FromV8(v8::Isolate* isolate,
+                     v8::Local<v8::Value> val,
+                     mate::Handle<T>* out) {
+    return mate::ConvertFromV8(isolate, val, out);
+  }
+};
+
+}  // namespace gin
+
 #endif  // NATIVE_MATE_NATIVE_MATE_HANDLE_H_
diff --git a/native_mate/native_mate/wrappable.cc b/native_mate/native_mate/wrappable.cc
index 086751dfc3d3..73f0502bd13a 100644
--- a/native_mate/native_mate/wrappable.cc
+++ b/native_mate/native_mate/wrappable.cc
@@ -5,6 +5,7 @@
 #include "native_mate/wrappable.h"
 
 #include "base/logging.h"
+#include "gin/arguments.h"
 #include "native_mate/dictionary.h"
 #include "native_mate/object_template_builder_deprecated.h"
 
@@ -37,6 +38,12 @@ v8::MaybeLocal<v8::Object> WrappableBase::GetWrapper(
     return v8::MaybeLocal<v8::Object>();
 }
 
+void WrappableBase::InitWithArgs(gin::Arguments* args) {
+  v8::Local<v8::Object> holder;
+  args->GetHolder(&holder);
+  InitWith(args->isolate(), holder);
+}
+
 void WrappableBase::InitWith(v8::Isolate* isolate,
                              v8::Local<v8::Object> wrapper) {
   CHECK(wrapper_.IsEmpty());
diff --git a/native_mate/native_mate/wrappable.h b/native_mate/native_mate/wrappable.h
index 94fdff080439..0e4dcdd1a309 100644
--- a/native_mate/native_mate/wrappable.h
+++ b/native_mate/native_mate/wrappable.h
@@ -97,4 +97,28 @@ struct Converter<T*,
 
 }  // namespace mate
 
+namespace gin {
+
+// Provides compatibility for gin.
+template <typename T>
+struct Converter<
+    T*,
+    typename std::enable_if<
+        std::is_convertible<T*, mate::WrappableBase*>::value>::type> {
+  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, T* val) {
+    if (val)
+      return val->GetWrapper();
+    else
+      return v8::Null(isolate);
+  }
+
+  static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val, T** out) {
+    *out = static_cast<T*>(static_cast<mate::WrappableBase*>(
+        mate::internal::FromV8Impl(isolate, val)));
+    return *out != nullptr;
+  }
+};
+
+}  // namespace gin
+
 #endif  // NATIVE_MATE_NATIVE_MATE_WRAPPABLE_H_
diff --git a/native_mate/native_mate/wrappable_base.h b/native_mate/native_mate/wrappable_base.h
index 526bb1aea7c8..6df70b671dfe 100644
--- a/native_mate/native_mate/wrappable_base.h
+++ b/native_mate/native_mate/wrappable_base.h
@@ -6,8 +6,9 @@
 #define NATIVE_MATE_NATIVE_MATE_WRAPPABLE_BASE_H_
 
 namespace gin {
+class Arguments;
 struct Destroyable;
-}
+}  // namespace gin
 
 namespace mate {
 
@@ -47,6 +48,9 @@ class WrappableBase {
   // This method should only be called by classes using Constructor.
   virtual void InitWith(v8::Isolate* isolate, v8::Local<v8::Object> wrapper);
 
+  // Helper to migrate from native_mate to gin.
+  void InitWithArgs(gin::Arguments* args);
+
  private:
   friend struct gin::Destroyable;
 
diff --git a/shell/browser/api/atom_api_browser_view.cc b/shell/browser/api/atom_api_browser_view.cc
index 18a122cb08bf..478f95bbd216 100644
--- a/shell/browser/api/atom_api_browser_view.cc
+++ b/shell/browser/api/atom_api_browser_view.cc
@@ -57,15 +57,9 @@ namespace electron {
 
 namespace api {
 
-BrowserView::BrowserView(v8::Isolate* isolate,
-                         v8::Local<v8::Object> wrapper,
+BrowserView::BrowserView(gin::Arguments* args,
                          const mate::Dictionary& options) {
-  Init(isolate, wrapper, options);
-}
-
-void BrowserView::Init(v8::Isolate* isolate,
-                       v8::Local<v8::Object> wrapper,
-                       const mate::Dictionary& options) {
+  v8::Isolate* isolate = args->isolate();
   mate::Dictionary web_preferences = mate::Dictionary::CreateEmpty(isolate);
   options.Get(options::kWebPreferences, &web_preferences);
   web_preferences.Set("type", "browserView");
@@ -79,7 +73,7 @@ void BrowserView::Init(v8::Isolate* isolate,
   view_.reset(
       NativeBrowserView::Create(api_web_contents_->managed_web_contents()));
 
-  InitWith(isolate, wrapper);
+  InitWithArgs(args);
 }
 
 BrowserView::~BrowserView() {
@@ -96,16 +90,17 @@ void BrowserView::WebContentsDestroyed() {
 }
 
 // static
-mate::WrappableBase* BrowserView::New(mate::Arguments* args) {
+mate::WrappableBase* BrowserView::New(gin_helper::ErrorThrower thrower,
+                                      gin::Arguments* args) {
   if (!Browser::Get()->is_ready()) {
-    args->ThrowError("Cannot create BrowserView before app is ready");
+    thrower.ThrowError("Cannot create BrowserView before app is ready");
     return nullptr;
   }
 
   mate::Dictionary options = mate::Dictionary::CreateEmpty(args->isolate());
   args->GetNext(&options);
 
-  return new BrowserView(args->isolate(), args->GetThis(), options);
+  return new BrowserView(args, options);
 }
 
 int32_t BrowserView::ID() const {
diff --git a/shell/browser/api/atom_api_browser_view.h b/shell/browser/api/atom_api_browser_view.h
index 5d02406608ab..59ce541f4a74 100644
--- a/shell/browser/api/atom_api_browser_view.h
+++ b/shell/browser/api/atom_api_browser_view.h
@@ -12,6 +12,7 @@
 #include "native_mate/handle.h"
 #include "shell/browser/api/trackable_object.h"
 #include "shell/browser/native_browser_view.h"
+#include "shell/common/gin_helper/error_thrower.h"
 
 namespace gfx {
 class Rect;
@@ -33,7 +34,8 @@ class WebContents;
 class BrowserView : public mate::TrackableObject<BrowserView>,
                     public content::WebContentsObserver {
  public:
-  static mate::WrappableBase* New(mate::Arguments* args);
+  static mate::WrappableBase* New(gin_helper::ErrorThrower thrower,
+                                  gin::Arguments* args);
 
   static void BuildPrototype(v8::Isolate* isolate,
                              v8::Local<v8::FunctionTemplate> prototype);
@@ -44,19 +46,13 @@ class BrowserView : public mate::TrackableObject<BrowserView>,
   int32_t ID() const;
 
  protected:
-  BrowserView(v8::Isolate* isolate,
-              v8::Local<v8::Object> wrapper,
-              const mate::Dictionary& options);
+  BrowserView(gin::Arguments* args, const mate::Dictionary& options);
   ~BrowserView() override;
 
   // content::WebContentsObserver:
   void WebContentsDestroyed() override;
 
  private:
-  void Init(v8::Isolate* isolate,
-            v8::Local<v8::Object> wrapper,
-            const mate::Dictionary& options);
-
   void SetAutoResize(AutoResizeFlags flags);
   void SetBounds(const gfx::Rect& bounds);
   gfx::Rect GetBounds();
diff --git a/shell/browser/api/atom_api_browser_window.cc b/shell/browser/api/atom_api_browser_window.cc
index 172830252167..4e85062dc971 100644
--- a/shell/browser/api/atom_api_browser_window.cc
+++ b/shell/browser/api/atom_api_browser_window.cc
@@ -29,13 +29,13 @@ namespace electron {
 
 namespace api {
 
-BrowserWindow::BrowserWindow(v8::Isolate* isolate,
-                             v8::Local<v8::Object> wrapper,
+BrowserWindow::BrowserWindow(gin::Arguments* args,
                              const mate::Dictionary& options)
-    : TopLevelWindow(isolate, options), weak_factory_(this) {
+    : TopLevelWindow(args->isolate(), options), weak_factory_(this) {
   mate::Handle<class WebContents> web_contents;
 
   // Use options.webPreferences in WebContents.
+  v8::Isolate* isolate = args->isolate();
   mate::Dictionary web_preferences = mate::Dictionary::CreateEmpty(isolate);
   options.Get(options::kWebPreferences, &web_preferences);
 
@@ -92,7 +92,7 @@ BrowserWindow::BrowserWindow(v8::Isolate* isolate,
   if (host)
     host->GetWidget()->AddInputEventObserver(this);
 
-  InitWith(isolate, wrapper);
+  InitWithArgs(args);
 
 #if defined(OS_MACOSX)
   OverrideNSWindowContentView(web_contents->managed_web_contents());
@@ -444,9 +444,10 @@ void BrowserWindow::OnWindowHide() {
 }
 
 // static
-mate::WrappableBase* BrowserWindow::New(mate::Arguments* args) {
+mate::WrappableBase* BrowserWindow::New(gin_helper::ErrorThrower thrower,
+                                        gin::Arguments* args) {
   if (!Browser::Get()->is_ready()) {
-    args->ThrowError("Cannot create BrowserWindow before app is ready");
+    thrower.ThrowError("Cannot create BrowserWindow before app is ready");
     return nullptr;
   }
 
@@ -460,7 +461,7 @@ mate::WrappableBase* BrowserWindow::New(mate::Arguments* args) {
     options = mate::Dictionary::CreateEmpty(args->isolate());
   }
 
-  return new BrowserWindow(args->isolate(), args->GetThis(), options);
+  return new BrowserWindow(args, options);
 }
 
 // static
diff --git a/shell/browser/api/atom_api_browser_window.h b/shell/browser/api/atom_api_browser_window.h
index a7f64aac7151..c0a9900b5973 100644
--- a/shell/browser/api/atom_api_browser_window.h
+++ b/shell/browser/api/atom_api_browser_window.h
@@ -12,6 +12,7 @@
 #include "base/cancelable_callback.h"
 #include "shell/browser/api/atom_api_top_level_window.h"
 #include "shell/browser/api/atom_api_web_contents.h"
+#include "shell/common/gin_helper/error_thrower.h"
 
 namespace electron {
 
@@ -22,7 +23,8 @@ class BrowserWindow : public TopLevelWindow,
                       public content::WebContentsObserver,
                       public ExtendedWebContentsObserver {
  public:
-  static mate::WrappableBase* New(mate::Arguments* args);
+  static mate::WrappableBase* New(gin_helper::ErrorThrower thrower,
+                                  gin::Arguments* args);
 
   static void BuildPrototype(v8::Isolate* isolate,
                              v8::Local<v8::FunctionTemplate> prototype);
@@ -36,9 +38,7 @@ class BrowserWindow : public TopLevelWindow,
   }
 
  protected:
-  BrowserWindow(v8::Isolate* isolate,
-                v8::Local<v8::Object> wrapper,
-                const mate::Dictionary& options);
+  BrowserWindow(gin::Arguments* args, const mate::Dictionary& options);
   ~BrowserWindow() override;
 
   // content::RenderWidgetHost::InputEventObserver:
diff --git a/shell/browser/api/atom_api_menu.cc b/shell/browser/api/atom_api_menu.cc
index e9dbd27ba0b4..d28439eabcaa 100644
--- a/shell/browser/api/atom_api_menu.cc
+++ b/shell/browser/api/atom_api_menu.cc
@@ -28,9 +28,8 @@ namespace electron {
 
 namespace api {
 
-Menu::Menu(v8::Isolate* isolate, v8::Local<v8::Object> wrapper)
-    : model_(new AtomMenuModel(this)) {
-  InitWith(isolate, wrapper);
+Menu::Menu(gin::Arguments* args) : model_(new AtomMenuModel(this)) {
+  InitWithArgs(args);
   model_->AddObserver(this);
 }
 
diff --git a/shell/browser/api/atom_api_menu.h b/shell/browser/api/atom_api_menu.h
index 23846d0dce22..b67eb925f19b 100644
--- a/shell/browser/api/atom_api_menu.h
+++ b/shell/browser/api/atom_api_menu.h
@@ -9,6 +9,7 @@
 #include <string>
 
 #include "base/callback.h"
+#include "gin/arguments.h"
 #include "shell/browser/api/atom_api_top_level_window.h"
 #include "shell/browser/api/trackable_object.h"
 #include "shell/browser/ui/atom_menu_model.h"
@@ -21,7 +22,7 @@ class Menu : public mate::TrackableObject<Menu>,
              public AtomMenuModel::Delegate,
              public AtomMenuModel::Observer {
  public:
-  static mate::WrappableBase* New(mate::Arguments* args);
+  static mate::WrappableBase* New(gin::Arguments* args);
 
   static void BuildPrototype(v8::Isolate* isolate,
                              v8::Local<v8::FunctionTemplate> prototype);
@@ -37,7 +38,7 @@ class Menu : public mate::TrackableObject<Menu>,
   AtomMenuModel* model() const { return model_.get(); }
 
  protected:
-  Menu(v8::Isolate* isolate, v8::Local<v8::Object> wrapper);
+  explicit Menu(gin::Arguments* args);
   ~Menu() override;
 
   // mate::Wrappable:
@@ -144,31 +145,4 @@ struct Converter<electron::AtomMenuModel*> {
 
 }  // namespace mate
 
-namespace gin {
-
-template <>
-struct Converter<electron::AtomMenuModel*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::AtomMenuModel** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-};
-
-// TODO(zcbenz): Remove this after converting Menu to gin::Wrapper.
-template <>
-struct Converter<electron::api::Menu*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::api::Menu** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   electron::api::Menu* in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-};
-
-}  // namespace gin
-
 #endif  // SHELL_BROWSER_API_ATOM_API_MENU_H_
diff --git a/shell/browser/api/atom_api_menu_mac.h b/shell/browser/api/atom_api_menu_mac.h
index a2885c4ef9b5..db7d9f4d2784 100644
--- a/shell/browser/api/atom_api_menu_mac.h
+++ b/shell/browser/api/atom_api_menu_mac.h
@@ -20,7 +20,7 @@ namespace api {
 
 class MenuMac : public Menu {
  protected:
-  MenuMac(v8::Isolate* isolate, v8::Local<v8::Object> wrapper);
+  explicit MenuMac(gin::Arguments* args);
   ~MenuMac() override;
 
   void PopupAt(TopLevelWindow* window,
diff --git a/shell/browser/api/atom_api_menu_mac.mm b/shell/browser/api/atom_api_menu_mac.mm
index 3119f9453dd9..246918ab22dc 100644
--- a/shell/browser/api/atom_api_menu_mac.mm
+++ b/shell/browser/api/atom_api_menu_mac.mm
@@ -30,8 +30,7 @@ namespace electron {
 
 namespace api {
 
-MenuMac::MenuMac(v8::Isolate* isolate, v8::Local<v8::Object> wrapper)
-    : Menu(isolate, wrapper), weak_factory_(this) {}
+MenuMac::MenuMac(gin::Arguments* args) : Menu(args), weak_factory_(this) {}
 
 MenuMac::~MenuMac() = default;
 
@@ -173,8 +172,8 @@ void Menu::SendActionToFirstResponder(const std::string& action) {
 }
 
 // static
-mate::WrappableBase* Menu::New(mate::Arguments* args) {
-  return new MenuMac(args->isolate(), args->GetThis());
+mate::WrappableBase* Menu::New(gin::Arguments* args) {
+  return new MenuMac(args);
 }
 
 }  // namespace api
diff --git a/shell/browser/api/atom_api_menu_views.cc b/shell/browser/api/atom_api_menu_views.cc
index f93160dc47cc..fa51699dbd98 100644
--- a/shell/browser/api/atom_api_menu_views.cc
+++ b/shell/browser/api/atom_api_menu_views.cc
@@ -16,8 +16,7 @@ namespace electron {
 
 namespace api {
 
-MenuViews::MenuViews(v8::Isolate* isolate, v8::Local<v8::Object> wrapper)
-    : Menu(isolate, wrapper), weak_factory_(this) {}
+MenuViews::MenuViews(gin::Arguments* args) : Menu(args), weak_factory_(this) {}
 
 MenuViews::~MenuViews() = default;
 
@@ -75,8 +74,8 @@ void MenuViews::OnClosed(int32_t window_id, base::Closure callback) {
 }
 
 // static
-mate::WrappableBase* Menu::New(mate::Arguments* args) {
-  return new MenuViews(args->isolate(), args->GetThis());
+mate::WrappableBase* Menu::New(gin::Arguments* args) {
+  return new MenuViews(args);
 }
 
 }  // namespace api
diff --git a/shell/browser/api/atom_api_menu_views.h b/shell/browser/api/atom_api_menu_views.h
index 30744e2d8a41..f2e4c28103f5 100644
--- a/shell/browser/api/atom_api_menu_views.h
+++ b/shell/browser/api/atom_api_menu_views.h
@@ -19,7 +19,7 @@ namespace api {
 
 class MenuViews : public Menu {
  public:
-  MenuViews(v8::Isolate* isolate, v8::Local<v8::Object> wrapper);
+  explicit MenuViews(gin::Arguments* args);
   ~MenuViews() override;
 
  protected:
diff --git a/shell/browser/api/atom_api_native_theme.h b/shell/browser/api/atom_api_native_theme.h
index b5b41eb66d74..c5e291efefb9 100644
--- a/shell/browser/api/atom_api_native_theme.h
+++ b/shell/browser/api/atom_api_native_theme.h
@@ -60,20 +60,6 @@ struct Converter<ui::NativeTheme::ThemeSource> {
                      ui::NativeTheme::ThemeSource* out);
 };
 
-// TODO(zcbenz): Remove this after converting NativeTheme to gin::Wrapper.
-template <>
-struct Converter<electron::api::NativeTheme*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::api::NativeTheme** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   electron::api::NativeTheme* in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-};
-
 }  // namespace gin
 
 #endif  // SHELL_BROWSER_API_ATOM_API_NATIVE_THEME_H_
diff --git a/shell/browser/api/atom_api_notification.cc b/shell/browser/api/atom_api_notification.cc
index 8a2f98943b7b..769f6f95cb9e 100644
--- a/shell/browser/api/atom_api_notification.cc
+++ b/shell/browser/api/atom_api_notification.cc
@@ -49,9 +49,8 @@ namespace electron {
 
 namespace api {
 
-Notification::Notification(v8::Local<v8::Object> wrapper,
-                           gin::Arguments* args) {
-  InitWith(args->isolate(), wrapper);
+Notification::Notification(gin::Arguments* args) {
+  InitWithArgs(args);
 
   presenter_ = static_cast<AtomBrowserClient*>(AtomBrowserClient::Get())
                    ->GetNotificationPresenter();
@@ -82,13 +81,13 @@ Notification::~Notification() {
 }
 
 // static
-mate::WrappableBase* Notification::New(mate::Arguments* args) {
+mate::WrappableBase* Notification::New(gin_helper::ErrorThrower thrower,
+                                       gin::Arguments* args) {
   if (!Browser::Get()->is_ready()) {
-    args->ThrowError("Cannot create Notification before app is ready");
+    thrower.ThrowError("Cannot create Notification before app is ready");
     return nullptr;
   }
-  gin::Arguments gin_args(args->info());
-  return new Notification(args->GetThis(), &gin_args);
+  return new Notification(args);
 }
 
 // Getters
diff --git a/shell/browser/api/atom_api_notification.h b/shell/browser/api/atom_api_notification.h
index 9aa84f5b29cc..23f5a7b45875 100644
--- a/shell/browser/api/atom_api_notification.h
+++ b/shell/browser/api/atom_api_notification.h
@@ -14,6 +14,7 @@
 #include "shell/browser/notifications/notification.h"
 #include "shell/browser/notifications/notification_delegate.h"
 #include "shell/browser/notifications/notification_presenter.h"
+#include "shell/common/gin_helper/error_thrower.h"
 #include "ui/gfx/image/image.h"
 
 namespace gin {
@@ -27,7 +28,8 @@ namespace api {
 class Notification : public mate::TrackableObject<Notification>,
                      public NotificationDelegate {
  public:
-  static mate::WrappableBase* New(mate::Arguments* args);
+  static mate::WrappableBase* New(gin_helper::ErrorThrower thrower,
+                                  gin::Arguments* args);
   static bool IsSupported();
 
   static void BuildPrototype(v8::Isolate* isolate,
@@ -42,7 +44,7 @@ class Notification : public mate::TrackableObject<Notification>,
   void NotificationClosed() override;
 
  protected:
-  Notification(v8::Local<v8::Object> wrapper, gin::Arguments* args);
+  explicit Notification(gin::Arguments* args);
   ~Notification() override;
 
   void Show();
@@ -101,22 +103,4 @@ class Notification : public mate::TrackableObject<Notification>,
 
 }  // namespace electron
 
-namespace gin {
-
-// TODO(zcbenz): Remove this after converting Notification to gin::Wrapper.
-template <>
-struct Converter<electron::api::Notification*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::api::Notification** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   electron::api::Notification* in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-};
-
-}  // namespace gin
-
 #endif  // SHELL_BROWSER_API_ATOM_API_NOTIFICATION_H_
diff --git a/shell/browser/api/atom_api_protocol_ns.cc b/shell/browser/api/atom_api_protocol_ns.cc
index 7778303454b7..83963c24d870 100644
--- a/shell/browser/api/atom_api_protocol_ns.cc
+++ b/shell/browser/api/atom_api_protocol_ns.cc
@@ -13,8 +13,10 @@
 #include "shell/browser/atom_browser_context.h"
 #include "shell/browser/browser.h"
 #include "shell/common/deprecate_util.h"
-#include "shell/common/native_mate_converters/net_converter.h"
-#include "shell/common/native_mate_converters/once_callback.h"
+#include "shell/common/gin_converters/callback_converter.h"
+#include "shell/common/gin_converters/net_converter.h"
+#include "shell/common/gin_helper/dictionary.h"
+#include "shell/common/gin_helper/object_template_builder.h"
 #include "shell/common/options_switches.h"
 #include "shell/common/promise_util.h"
 
@@ -39,19 +41,19 @@ struct CustomScheme {
 
 }  // namespace
 
-namespace mate {
+namespace gin {
 
 template <>
 struct Converter<CustomScheme> {
   static bool FromV8(v8::Isolate* isolate,
                      v8::Local<v8::Value> val,
                      CustomScheme* out) {
-    mate::Dictionary dict;
+    gin::Dictionary dict(isolate);
     if (!ConvertFromV8(isolate, val, &dict))
       return false;
     if (!dict.Get("scheme", &(out->scheme)))
       return false;
-    mate::Dictionary opt;
+    gin::Dictionary opt(isolate);
     // options are optional. Default values specified in SchemeOptions are used
     if (dict.Get("privileges", &opt)) {
       opt.Get("standard", &(out->options.standard));
@@ -66,7 +68,7 @@ struct Converter<CustomScheme> {
   }
 };
 
-}  // namespace mate
+}  // namespace gin
 
 namespace electron {
 namespace api {
@@ -75,11 +77,11 @@ std::vector<std::string> GetStandardSchemes() {
   return g_standard_schemes;
 }
 
-void RegisterSchemesAsPrivileged(v8::Local<v8::Value> val,
-                                 mate::Arguments* args) {
+void RegisterSchemesAsPrivileged(gin_helper::ErrorThrower thrower,
+                                 v8::Local<v8::Value> val) {
   std::vector<CustomScheme> custom_schemes;
-  if (!mate::ConvertFromV8(args->isolate(), val, &custom_schemes)) {
-    args->ThrowError("Argument must be an array of custom schemes.");
+  if (!gin::ConvertFromV8(thrower.isolate(), val, &custom_schemes)) {
+    thrower.ThrowError("Argument must be an array of custom schemes.");
     return;
   }
 
@@ -181,7 +183,7 @@ ProtocolError ProtocolNS::RegisterProtocol(ProtocolType type,
 }
 
 void ProtocolNS::UnregisterProtocol(const std::string& scheme,
-                                    mate::Arguments* args) {
+                                    gin::Arguments* args) {
   const bool removed = handlers_.erase(scheme) != 0;
   const auto error =
       removed ? ProtocolError::OK : ProtocolError::NOT_REGISTERED;
@@ -201,7 +203,7 @@ ProtocolError ProtocolNS::InterceptProtocol(ProtocolType type,
 }
 
 void ProtocolNS::UninterceptProtocol(const std::string& scheme,
-                                     mate::Arguments* args) {
+                                     gin::Arguments* args) {
   const bool removed = intercept_handlers_.erase(scheme) != 0;
   const auto error =
       removed ? ProtocolError::OK : ProtocolError::NOT_INTERCEPTED;
@@ -213,7 +215,7 @@ bool ProtocolNS::IsProtocolIntercepted(const std::string& scheme) {
 }
 
 v8::Local<v8::Promise> ProtocolNS::IsProtocolHandled(const std::string& scheme,
-                                                     mate::Arguments* args) {
+                                                     gin::Arguments* args) {
   node::Environment* env = node::Environment::GetCurrent(args->isolate());
   EmitDeprecationWarning(
       env,
@@ -234,7 +236,7 @@ v8::Local<v8::Promise> ProtocolNS::IsProtocolHandled(const std::string& scheme,
                      base::Contains(kBuiltinSchemes, scheme));
 }
 
-void ProtocolNS::HandleOptionalCallback(mate::Arguments* args,
+void ProtocolNS::HandleOptionalCallback(gin::Arguments* args,
                                         ProtocolError error) {
   CompletionCallback callback;
   if (args->GetNext(&callback)) {
@@ -247,22 +249,22 @@ void ProtocolNS::HandleOptionalCallback(mate::Arguments* args,
       callback.Run(v8::Null(args->isolate()));
     else
       callback.Run(v8::Exception::Error(
-          mate::StringToV8(isolate(), ErrorCodeToString(error))));
+          gin::StringToV8(isolate(), ErrorCodeToString(error))));
   }
 }
 
 // static
-mate::Handle<ProtocolNS> ProtocolNS::Create(
+gin::Handle<ProtocolNS> ProtocolNS::Create(
     v8::Isolate* isolate,
     AtomBrowserContext* browser_context) {
-  return mate::CreateHandle(isolate, new ProtocolNS(isolate, browser_context));
+  return gin::CreateHandle(isolate, new ProtocolNS(isolate, browser_context));
 }
 
 // static
 void ProtocolNS::BuildPrototype(v8::Isolate* isolate,
                                 v8::Local<v8::FunctionTemplate> prototype) {
-  prototype->SetClassName(mate::StringToV8(isolate, "Protocol"));
-  mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
+  prototype->SetClassName(gin::StringToV8(isolate, "Protocol"));
+  gin_helper::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
       .SetMethod("registerStringProtocol",
                  &ProtocolNS::RegisterProtocolFor<ProtocolType::kString>)
       .SetMethod("registerBufferProtocol",
@@ -299,16 +301,16 @@ void ProtocolNS::BuildPrototype(v8::Isolate* isolate,
 
 namespace {
 
-void RegisterSchemesAsPrivileged(v8::Local<v8::Value> val,
-                                 mate::Arguments* args) {
+void RegisterSchemesAsPrivileged(gin_helper::ErrorThrower thrower,
+                                 v8::Local<v8::Value> val) {
   if (electron::Browser::Get()->is_ready()) {
-    args->ThrowError(
+    thrower.ThrowError(
         "protocol.registerSchemesAsPrivileged should be called before "
         "app is ready");
     return;
   }
 
-  electron::api::RegisterSchemesAsPrivileged(val, args);
+  electron::api::RegisterSchemesAsPrivileged(thrower, val);
 }
 
 void Initialize(v8::Local<v8::Object> exports,
@@ -316,7 +318,7 @@ void Initialize(v8::Local<v8::Object> exports,
                 v8::Local<v8::Context> context,
                 void* priv) {
   v8::Isolate* isolate = context->GetIsolate();
-  mate::Dictionary dict(isolate, exports);
+  gin_helper::Dictionary dict(isolate, exports);
   dict.SetMethod("registerSchemesAsPrivileged", &RegisterSchemesAsPrivileged);
   dict.SetMethod("getStandardSchemes", &electron::api::GetStandardSchemes);
 }
diff --git a/shell/browser/api/atom_api_protocol_ns.h b/shell/browser/api/atom_api_protocol_ns.h
index 44fa89ea3af8..b8cd623c5739 100644
--- a/shell/browser/api/atom_api_protocol_ns.h
+++ b/shell/browser/api/atom_api_protocol_ns.h
@@ -9,10 +9,10 @@
 #include <vector>
 
 #include "content/public/browser/content_browser_client.h"
-#include "native_mate/dictionary.h"
-#include "native_mate/handle.h"
+#include "gin/handle.h"
 #include "shell/browser/api/trackable_object.h"
 #include "shell/browser/net/atom_url_loader_factory.h"
+#include "shell/common/gin_helper/dictionary.h"
 
 namespace electron {
 
@@ -22,8 +22,8 @@ namespace api {
 
 std::vector<std::string> GetStandardSchemes();
 
-void RegisterSchemesAsPrivileged(v8::Local<v8::Value> val,
-                                 mate::Arguments* args);
+void RegisterSchemesAsPrivileged(gin_helper::ErrorThrower thrower,
+                                 v8::Local<v8::Value> val);
 
 // Possible errors.
 enum class ProtocolError {
@@ -37,8 +37,8 @@ enum class ProtocolError {
 // Protocol implementation based on network services.
 class ProtocolNS : public mate::TrackableObject<ProtocolNS> {
  public:
-  static mate::Handle<ProtocolNS> Create(v8::Isolate* isolate,
-                                         AtomBrowserContext* browser_context);
+  static gin::Handle<ProtocolNS> Create(v8::Isolate* isolate,
+                                        AtomBrowserContext* browser_context);
 
   static void BuildPrototype(v8::Isolate* isolate,
                              v8::Local<v8::FunctionTemplate> prototype);
@@ -61,35 +61,35 @@ class ProtocolNS : public mate::TrackableObject<ProtocolNS> {
   ProtocolError RegisterProtocol(ProtocolType type,
                                  const std::string& scheme,
                                  const ProtocolHandler& handler);
-  void UnregisterProtocol(const std::string& scheme, mate::Arguments* args);
+  void UnregisterProtocol(const std::string& scheme, gin::Arguments* args);
   bool IsProtocolRegistered(const std::string& scheme);
 
   ProtocolError InterceptProtocol(ProtocolType type,
                                   const std::string& scheme,
                                   const ProtocolHandler& handler);
-  void UninterceptProtocol(const std::string& scheme, mate::Arguments* args);
+  void UninterceptProtocol(const std::string& scheme, gin::Arguments* args);
   bool IsProtocolIntercepted(const std::string& scheme);
 
   // Old async version of IsProtocolRegistered.
   v8::Local<v8::Promise> IsProtocolHandled(const std::string& scheme,
-                                           mate::Arguments* args);
+                                           gin::Arguments* args);
 
   // Helper for converting old registration APIs to new RegisterProtocol API.
   template <ProtocolType type>
   void RegisterProtocolFor(const std::string& scheme,
                            const ProtocolHandler& handler,
-                           mate::Arguments* args) {
+                           gin::Arguments* args) {
     HandleOptionalCallback(args, RegisterProtocol(type, scheme, handler));
   }
   template <ProtocolType type>
   void InterceptProtocolFor(const std::string& scheme,
                             const ProtocolHandler& handler,
-                            mate::Arguments* args) {
+                            gin::Arguments* args) {
     HandleOptionalCallback(args, InterceptProtocol(type, scheme, handler));
   }
 
   // Be compatible with old interface, which accepts optional callback.
-  void HandleOptionalCallback(mate::Arguments* args, ProtocolError error);
+  void HandleOptionalCallback(gin::Arguments* args, ProtocolError error);
 
   HandlersMap handlers_;
   HandlersMap intercept_handlers_;
diff --git a/shell/browser/api/atom_api_session.h b/shell/browser/api/atom_api_session.h
index 815168e100fe..1e18ba2733a9 100644
--- a/shell/browser/api/atom_api_session.h
+++ b/shell/browser/api/atom_api_session.h
@@ -121,22 +121,4 @@ class Session : public mate::TrackableObject<Session>,
 
 }  // namespace electron
 
-namespace gin {
-
-// TODO(zcbenz): Remove this after converting Session to gin::Wrapper.
-template <>
-struct Converter<electron::api::Session*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::api::Session** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   electron::api::Session* in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-};
-
-}  // namespace gin
-
 #endif  // SHELL_BROWSER_API_ATOM_API_SESSION_H_
diff --git a/shell/browser/api/atom_api_top_level_window.cc b/shell/browser/api/atom_api_top_level_window.cc
index f2df07158cb9..9db8efcf9980 100644
--- a/shell/browser/api/atom_api_top_level_window.cc
+++ b/shell/browser/api/atom_api_top_level_window.cc
@@ -108,11 +108,10 @@ TopLevelWindow::TopLevelWindow(v8::Isolate* isolate,
 #endif
 }
 
-TopLevelWindow::TopLevelWindow(v8::Isolate* isolate,
-                               v8::Local<v8::Object> wrapper,
+TopLevelWindow::TopLevelWindow(gin::Arguments* args,
                                const mate::Dictionary& options)
-    : TopLevelWindow(isolate, options) {
-  InitWith(isolate, wrapper);
+    : TopLevelWindow(args->isolate(), options) {
+  InitWithArgs(args);
   // Init window after everything has been setup.
   window()->InitFromOptions(options);
 }
@@ -1057,11 +1056,11 @@ void TopLevelWindow::RemoveFromParentChildWindows() {
 }
 
 // static
-mate::WrappableBase* TopLevelWindow::New(mate::Arguments* args) {
+mate::WrappableBase* TopLevelWindow::New(gin::Arguments* args) {
   mate::Dictionary options = mate::Dictionary::CreateEmpty(args->isolate());
   args->GetNext(&options);
 
-  return new TopLevelWindow(args->isolate(), args->GetThis(), options);
+  return new TopLevelWindow(args, options);
 }
 
 // static
diff --git a/shell/browser/api/atom_api_top_level_window.h b/shell/browser/api/atom_api_top_level_window.h
index 6401fe94553a..b4429fad00dd 100644
--- a/shell/browser/api/atom_api_top_level_window.h
+++ b/shell/browser/api/atom_api_top_level_window.h
@@ -28,7 +28,7 @@ class View;
 class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
                        public NativeWindowObserver {
  public:
-  static mate::WrappableBase* New(mate::Arguments* args);
+  static mate::WrappableBase* New(gin::Arguments* args);
 
   static void BuildPrototype(v8::Isolate* isolate,
                              v8::Local<v8::FunctionTemplate> prototype);
@@ -43,9 +43,7 @@ class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
   // Common constructor.
   TopLevelWindow(v8::Isolate* isolate, const mate::Dictionary& options);
   // Creating independent TopLevelWindow instance.
-  TopLevelWindow(v8::Isolate* isolate,
-                 v8::Local<v8::Object> wrapper,
-                 const mate::Dictionary& options);
+  TopLevelWindow(gin::Arguments* args, const mate::Dictionary& options);
   ~TopLevelWindow() override;
 
   // TrackableObject:
@@ -266,22 +264,4 @@ class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
 
 }  // namespace electron
 
-namespace gin {
-
-// TODO(zcbenz): Remove this after converting TopLevelWindow to gin::Wrapper.
-template <>
-struct Converter<electron::api::TopLevelWindow*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::api::TopLevelWindow** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   electron::api::TopLevelWindow* in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-};
-
-}  // namespace gin
-
 #endif  // SHELL_BROWSER_API_ATOM_API_TOP_LEVEL_WINDOW_H_
diff --git a/shell/browser/api/atom_api_tray.cc b/shell/browser/api/atom_api_tray.cc
index b0f800bd0eea..06653239329f 100644
--- a/shell/browser/api/atom_api_tray.cc
+++ b/shell/browser/api/atom_api_tray.cc
@@ -55,26 +55,25 @@ namespace electron {
 
 namespace api {
 
-Tray::Tray(v8::Isolate* isolate,
-           v8::Local<v8::Object> wrapper,
-           mate::Handle<NativeImage> image)
+Tray::Tray(mate::Handle<NativeImage> image, gin::Arguments* args)
     : tray_icon_(TrayIcon::Create()) {
-  SetImage(isolate, image);
+  SetImage(args->isolate(), image);
   tray_icon_->AddObserver(this);
 
-  InitWith(isolate, wrapper);
+  InitWithArgs(args);
 }
 
 Tray::~Tray() = default;
 
 // static
-mate::WrappableBase* Tray::New(mate::Handle<NativeImage> image,
-                               mate::Arguments* args) {
+mate::WrappableBase* Tray::New(gin_helper::ErrorThrower thrower,
+                               mate::Handle<NativeImage> image,
+                               gin::Arguments* args) {
   if (!Browser::Get()->is_ready()) {
-    args->ThrowError("Cannot create Tray before app is ready");
+    thrower.ThrowError("Cannot create Tray before app is ready");
     return nullptr;
   }
-  return new Tray(args->isolate(), args->GetThis(), image);
+  return new Tray(image, args);
 }
 
 void Tray::OnClicked(const gfx::Rect& bounds,
diff --git a/shell/browser/api/atom_api_tray.h b/shell/browser/api/atom_api_tray.h
index 719e265c7de4..a0a61ec47499 100644
--- a/shell/browser/api/atom_api_tray.h
+++ b/shell/browser/api/atom_api_tray.h
@@ -13,6 +13,7 @@
 #include "shell/browser/api/trackable_object.h"
 #include "shell/browser/ui/tray_icon.h"
 #include "shell/browser/ui/tray_icon_observer.h"
+#include "shell/common/gin_helper/error_thrower.h"
 
 namespace gfx {
 class Image;
@@ -34,16 +35,15 @@ class NativeImage;
 
 class Tray : public mate::TrackableObject<Tray>, public TrayIconObserver {
  public:
-  static mate::WrappableBase* New(mate::Handle<NativeImage> image,
-                                  mate::Arguments* args);
+  static mate::WrappableBase* New(gin_helper::ErrorThrower thrower,
+                                  mate::Handle<NativeImage> image,
+                                  gin::Arguments* args);
 
   static void BuildPrototype(v8::Isolate* isolate,
                              v8::Local<v8::FunctionTemplate> prototype);
 
  protected:
-  Tray(v8::Isolate* isolate,
-       v8::Local<v8::Object> wrapper,
-       mate::Handle<NativeImage> image);
+  Tray(mate::Handle<NativeImage> image, gin::Arguments* args);
   ~Tray() override;
 
   // TrayIconObserver:
diff --git a/shell/browser/api/atom_api_url_request_ns.cc b/shell/browser/api/atom_api_url_request_ns.cc
index 2d260e79e128..523db8c9cd8a 100644
--- a/shell/browser/api/atom_api_url_request_ns.cc
+++ b/shell/browser/api/atom_api_url_request_ns.cc
@@ -6,21 +6,22 @@
 
 #include <utility>
 
+#include "gin/handle.h"
 #include "mojo/public/cpp/bindings/receiver_set.h"
 #include "mojo/public/cpp/system/string_data_source.h"
-#include "native_mate/dictionary.h"
 #include "net/http/http_util.h"
 #include "services/network/public/mojom/chunked_data_pipe_getter.mojom.h"
 #include "shell/browser/api/atom_api_session.h"
 #include "shell/browser/atom_browser_context.h"
+#include "shell/common/gin_converters/gurl_converter.h"
+#include "shell/common/gin_converters/net_converter.h"
+#include "shell/common/gin_helper/dictionary.h"
 #include "shell/common/gin_helper/event_emitter_caller.h"
 #include "shell/common/gin_helper/object_template_builder.h"
-#include "shell/common/native_mate_converters/gurl_converter.h"
-#include "shell/common/native_mate_converters/net_converter.h"
 
 #include "shell/common/node_includes.h"
 
-namespace mate {
+namespace gin {
 
 template <>
 struct Converter<network::mojom::RedirectMode> {
@@ -42,7 +43,7 @@ struct Converter<network::mojom::RedirectMode> {
   }
 };
 
-}  // namespace mate
+}  // namespace gin
 
 namespace electron {
 
@@ -165,9 +166,9 @@ class ChunkedDataPipeGetter : public UploadDataPipeGetter,
   mojo::ReceiverSet<network::mojom::ChunkedDataPipeGetter> receiver_set_;
 };
 
-URLRequestNS::URLRequestNS(mate::Arguments* args) : weak_factory_(this) {
+URLRequestNS::URLRequestNS(gin::Arguments* args) : weak_factory_(this) {
   request_ = std::make_unique<network::ResourceRequest>();
-  mate::Dictionary dict;
+  gin_helper::Dictionary dict;
   if (args->GetNext(&dict)) {
     dict.Get("method", &request_->method);
     dict.Get("url", &request_->url);
@@ -186,7 +187,7 @@ URLRequestNS::URLRequestNS(mate::Arguments* args) : weak_factory_(this) {
 
   url_loader_factory_ = session->browser_context()->GetURLLoaderFactory();
 
-  InitWith(args->isolate(), args->GetThis());
+  InitWithArgs(args);
 }
 
 URLRequestNS::~URLRequestNS() = default;
@@ -518,7 +519,7 @@ void URLRequestNS::EmitEvent(EventType type, Args... args) {
 }
 
 // static
-mate::WrappableBase* URLRequestNS::New(mate::Arguments* args) {
+mate::WrappableBase* URLRequestNS::New(gin::Arguments* args) {
   return new URLRequestNS(args);
 }
 
diff --git a/shell/browser/api/atom_api_url_request_ns.h b/shell/browser/api/atom_api_url_request_ns.h
index da02b3a6ce84..54c3107de24d 100644
--- a/shell/browser/api/atom_api_url_request_ns.h
+++ b/shell/browser/api/atom_api_url_request_ns.h
@@ -28,13 +28,13 @@ class UploadDataPipeGetter;
 class URLRequestNS : public mate::EventEmitter<URLRequestNS>,
                      public network::SimpleURLLoaderStreamConsumer {
  public:
-  static mate::WrappableBase* New(mate::Arguments* args);
+  static mate::WrappableBase* New(gin::Arguments* args);
 
   static void BuildPrototype(v8::Isolate* isolate,
                              v8::Local<v8::FunctionTemplate> prototype);
 
  protected:
-  explicit URLRequestNS(mate::Arguments* args);
+  explicit URLRequestNS(gin::Arguments* args);
   ~URLRequestNS() override;
 
   bool NotStarted() const;
@@ -141,22 +141,4 @@ class URLRequestNS : public mate::EventEmitter<URLRequestNS>,
 
 }  // namespace electron
 
-namespace gin {
-
-// TODO(zcbenz): Remove this after converting URLRequestNS to gin::Wrapper.
-template <>
-struct Converter<electron::api::URLRequestNS*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::api::URLRequestNS** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   electron::api::URLRequestNS* in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-};
-
-}  // namespace gin
-
 #endif  // SHELL_BROWSER_API_ATOM_API_URL_REQUEST_NS_H_
diff --git a/shell/browser/api/atom_api_view.cc b/shell/browser/api/atom_api_view.cc
index f8778702fb98..78d5938f6f84 100644
--- a/shell/browser/api/atom_api_view.cc
+++ b/shell/browser/api/atom_api_view.cc
@@ -42,9 +42,9 @@ void View::AddChildViewAt(mate::Handle<View> child, size_t index) {
 #endif
 
 // static
-mate::WrappableBase* View::New(mate::Arguments* args) {
+mate::WrappableBase* View::New(gin::Arguments* args) {
   auto* view = new View();
-  view->InitWith(args->isolate(), args->GetThis());
+  view->InitWithArgs(args);
   return view;
 }
 
diff --git a/shell/browser/api/atom_api_view.h b/shell/browser/api/atom_api_view.h
index a5424758620b..b0f4cd4f77eb 100644
--- a/shell/browser/api/atom_api_view.h
+++ b/shell/browser/api/atom_api_view.h
@@ -19,7 +19,7 @@ namespace api {
 
 class View : public mate::TrackableObject<View> {
  public:
-  static mate::WrappableBase* New(mate::Arguments* args);
+  static mate::WrappableBase* New(gin::Arguments* args);
 
   static void BuildPrototype(v8::Isolate* isolate,
                              v8::Local<v8::FunctionTemplate> prototype);
diff --git a/shell/browser/api/atom_api_web_contents.h b/shell/browser/api/atom_api_web_contents.h
index db25c135cbac..87dd250bffcc 100644
--- a/shell/browser/api/atom_api_web_contents.h
+++ b/shell/browser/api/atom_api_web_contents.h
@@ -575,22 +575,4 @@ class WebContents : public mate::TrackableObject<WebContents>,
 
 }  // namespace electron
 
-namespace gin {
-
-// TODO(zcbenz): Remove this after converting WebContents to gin::Wrapper.
-template <>
-struct Converter<electron::api::WebContents*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::api::WebContents** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   electron::api::WebContents* in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-};
-
-}  // namespace gin
-
 #endif  // SHELL_BROWSER_API_ATOM_API_WEB_CONTENTS_H_
diff --git a/shell/browser/api/atom_api_web_contents_view.cc b/shell/browser/api/atom_api_web_contents_view.cc
index 9307db55c099..28e84b579581 100644
--- a/shell/browser/api/atom_api_web_contents_view.cc
+++ b/shell/browser/api/atom_api_web_contents_view.cc
@@ -80,7 +80,7 @@ void WebContentsView::WebContentsDestroyed() {
 
 // static
 mate::WrappableBase* WebContentsView::New(
-    mate::Arguments* args,
+    gin::Arguments* args,
     mate::Handle<WebContents> web_contents) {
   // Currently we only support InspectableWebContents, e.g. the WebContents
   // created by users directly. To support devToolsWebContents we need to create
@@ -101,7 +101,7 @@ mate::WrappableBase* WebContentsView::New(
   // Constructor call.
   auto* view = new WebContentsView(args->isolate(), web_contents,
                                    web_contents->managed_web_contents());
-  view->InitWith(args->isolate(), args->GetThis());
+  view->InitWithArgs(args);
   return view;
 }
 
diff --git a/shell/browser/api/atom_api_web_contents_view.h b/shell/browser/api/atom_api_web_contents_view.h
index f6a2bd81694e..6502cb7dd601 100644
--- a/shell/browser/api/atom_api_web_contents_view.h
+++ b/shell/browser/api/atom_api_web_contents_view.h
@@ -19,7 +19,7 @@ class WebContents;
 
 class WebContentsView : public View, public content::WebContentsObserver {
  public:
-  static mate::WrappableBase* New(mate::Arguments* args,
+  static mate::WrappableBase* New(gin::Arguments* args,
                                   mate::Handle<WebContents> web_contents);
 
   static void BuildPrototype(v8::Isolate* isolate,
diff --git a/shell/browser/api/atom_api_web_request_ns.h b/shell/browser/api/atom_api_web_request_ns.h
index c7bc8dc53f11..d4d3be8a3af5 100644
--- a/shell/browser/api/atom_api_web_request_ns.h
+++ b/shell/browser/api/atom_api_web_request_ns.h
@@ -13,8 +13,6 @@
 #include "gin/arguments.h"
 #include "gin/handle.h"
 #include "gin/wrappable.h"
-#include "native_mate/dictionary.h"
-#include "native_mate/handle.h"
 #include "shell/browser/net/proxying_url_loader_factory.h"
 
 namespace content {
diff --git a/shell/browser/net/atom_url_loader_factory.cc b/shell/browser/net/atom_url_loader_factory.cc
index a864270044a8..7898c8ea5b55 100644
--- a/shell/browser/net/atom_url_loader_factory.cc
+++ b/shell/browser/net/atom_url_loader_factory.cc
@@ -23,16 +23,16 @@
 #include "shell/browser/net/node_stream_loader.h"
 #include "shell/browser/net/url_pipe_loader.h"
 #include "shell/common/atom_constants.h"
-#include "shell/common/native_mate_converters/file_path_converter.h"
-#include "shell/common/native_mate_converters/gurl_converter.h"
-#include "shell/common/native_mate_converters/net_converter.h"
-#include "shell/common/native_mate_converters/value_converter.h"
+#include "shell/common/gin_converters/file_path_converter.h"
+#include "shell/common/gin_converters/gurl_converter.h"
+#include "shell/common/gin_converters/net_converter.h"
+#include "shell/common/gin_converters/value_converter_gin_adapter.h"
 
 #include "shell/common/node_includes.h"
 
 using content::BrowserThread;
 
-namespace mate {
+namespace gin {
 
 template <>
 struct Converter<electron::ProtocolType> {
@@ -58,7 +58,7 @@ struct Converter<electron::ProtocolType> {
   }
 };
 
-}  // namespace mate
+}  // namespace gin
 
 namespace electron {
 
@@ -77,17 +77,18 @@ bool ResponseMustBeObject(ProtocolType type) {
 }
 
 // Helper to convert value to Dictionary.
-mate::Dictionary ToDict(v8::Isolate* isolate, v8::Local<v8::Value> value) {
+gin::Dictionary ToDict(v8::Isolate* isolate, v8::Local<v8::Value> value) {
   if (!value->IsFunction() && value->IsObject())
-    return mate::Dictionary(
+    return gin::Dictionary(
         isolate,
         value->ToObject(isolate->GetCurrentContext()).ToLocalChecked());
   else
-    return mate::Dictionary();
+    return gin::Dictionary(isolate);
 }
 
 // Parse headers from response object.
-network::ResourceResponseHead ToResponseHead(const mate::Dictionary& dict) {
+network::ResourceResponseHead ToResponseHead(
+    const gin_helper::Dictionary& dict) {
   network::ResourceResponseHead head;
   head.mime_type = "text/html";
   head.charset = "utf-8";
@@ -197,7 +198,7 @@ void AtomURLLoaderFactory::StartLoading(
     const net::MutableNetworkTrafficAnnotationTag& traffic_annotation,
     network::mojom::URLLoaderFactory* proxy_factory,
     ProtocolType type,
-    mate::Arguments* args) {
+    gin::Arguments* args) {
   // Send network error when there is no argument passed.
   //
   // Note that we should not throw JS error in the callback no matter what is
@@ -210,7 +211,7 @@ void AtomURLLoaderFactory::StartLoading(
   }
 
   // Parse {error} object.
-  mate::Dictionary dict = ToDict(args->isolate(), response);
+  gin_helper::Dictionary dict = ToDict(args->isolate(), response);
   if (!dict.IsEmpty()) {
     int error_code;
     if (dict.Get("error", &error_code)) {
@@ -251,7 +252,7 @@ void AtomURLLoaderFactory::StartLoading(
     } else {
       StartLoadingHttp(std::move(loader), new_request, std::move(client),
                        traffic_annotation,
-                       mate::Dictionary::CreateEmpty(args->isolate()));
+                       gin::Dictionary::CreateEmpty(args->isolate()));
     }
     return;
   }
@@ -285,7 +286,7 @@ void AtomURLLoaderFactory::StartLoading(
       break;
     case ProtocolType::kFree:
       ProtocolType type;
-      if (!mate::ConvertFromV8(args->isolate(), response, &type)) {
+      if (!gin::ConvertFromV8(args->isolate(), response, &type)) {
         client->OnComplete(network::URLLoaderCompletionStatus(net::ERR_FAILED));
         return;
       }
@@ -300,7 +301,7 @@ void AtomURLLoaderFactory::StartLoading(
 void AtomURLLoaderFactory::StartLoadingBuffer(
     network::mojom::URLLoaderClientPtr client,
     network::ResourceResponseHead head,
-    const mate::Dictionary& dict) {
+    const gin_helper::Dictionary& dict) {
   v8::Local<v8::Value> buffer = dict.GetHandle();
   dict.Get("data", &buffer);
   if (!node::Buffer::HasInstance(buffer)) {
@@ -317,7 +318,7 @@ void AtomURLLoaderFactory::StartLoadingBuffer(
 void AtomURLLoaderFactory::StartLoadingString(
     network::mojom::URLLoaderClientPtr client,
     network::ResourceResponseHead head,
-    const mate::Dictionary& dict,
+    const gin_helper::Dictionary& dict,
     v8::Isolate* isolate,
     v8::Local<v8::Value> response) {
   std::string contents;
@@ -339,11 +340,11 @@ void AtomURLLoaderFactory::StartLoadingFile(
     network::ResourceRequest request,
     network::mojom::URLLoaderClientPtr client,
     network::ResourceResponseHead head,
-    const mate::Dictionary& dict,
+    const gin_helper::Dictionary& dict,
     v8::Isolate* isolate,
     v8::Local<v8::Value> response) {
   base::FilePath path;
-  if (mate::ConvertFromV8(isolate, response, &path)) {
+  if (gin::ConvertFromV8(isolate, response, &path)) {
     request.url = net::FilePathToFileURL(path);
   } else if (!dict.IsEmpty()) {
     dict.Get("referrer", &request.referrer);
@@ -366,7 +367,7 @@ void AtomURLLoaderFactory::StartLoadingHttp(
     const network::ResourceRequest& original_request,
     network::mojom::URLLoaderClientPtr client,
     const net::MutableNetworkTrafficAnnotationTag& traffic_annotation,
-    const mate::Dictionary& dict) {
+    const gin_helper::Dictionary& dict) {
   auto request = std::make_unique<network::ResourceRequest>();
   request->headers = original_request.headers;
   request->cors_exempt_headers = original_request.cors_exempt_headers;
@@ -407,7 +408,7 @@ void AtomURLLoaderFactory::StartLoadingStream(
     network::mojom::URLLoaderRequest loader,
     network::mojom::URLLoaderClientPtr client,
     network::ResourceResponseHead head,
-    const mate::Dictionary& dict) {
+    const gin_helper::Dictionary& dict) {
   v8::Local<v8::Value> stream;
   if (!dict.Get("data", &stream)) {
     // Assume the opts is already a stream.
@@ -435,7 +436,7 @@ void AtomURLLoaderFactory::StartLoadingStream(
     return;
   }
 
-  mate::Dictionary data = ToDict(dict.isolate(), stream);
+  gin_helper::Dictionary data = ToDict(dict.isolate(), stream);
   v8::Local<v8::Value> method;
   if (!data.Get("on", &method) || !method->IsFunction() ||
       !data.Get("removeListener", &method) || !method->IsFunction()) {
diff --git a/shell/browser/net/atom_url_loader_factory.h b/shell/browser/net/atom_url_loader_factory.h
index 875110c1e311..0038b2f3d174 100644
--- a/shell/browser/net/atom_url_loader_factory.h
+++ b/shell/browser/net/atom_url_loader_factory.h
@@ -10,10 +10,10 @@
 #include <utility>
 
 #include "mojo/public/cpp/bindings/binding_set.h"
-#include "native_mate/dictionary.h"
 #include "net/url_request/url_request_job_factory.h"
 #include "services/network/public/cpp/resource_response.h"
 #include "services/network/public/mojom/url_loader_factory.mojom.h"
+#include "shell/common/gin_helper/dictionary.h"
 
 namespace electron {
 
@@ -27,7 +27,7 @@ enum class ProtocolType {
   kFree,  // special type for returning arbitrary type of response.
 };
 
-using StartLoadingCallback = base::OnceCallback<void(mate::Arguments*)>;
+using StartLoadingCallback = base::OnceCallback<void(gin::Arguments*)>;
 using ProtocolHandler =
     base::Callback<void(const network::ResourceRequest&, StartLoadingCallback)>;
 
@@ -62,22 +62,22 @@ class AtomURLLoaderFactory : public network::mojom::URLLoaderFactory {
       const net::MutableNetworkTrafficAnnotationTag& traffic_annotation,
       network::mojom::URLLoaderFactory* proxy_factory,
       ProtocolType type,
-      mate::Arguments* args);
+      gin::Arguments* args);
 
  private:
   static void StartLoadingBuffer(network::mojom::URLLoaderClientPtr client,
                                  network::ResourceResponseHead head,
-                                 const mate::Dictionary& dict);
+                                 const gin_helper::Dictionary& dict);
   static void StartLoadingString(network::mojom::URLLoaderClientPtr client,
                                  network::ResourceResponseHead head,
-                                 const mate::Dictionary& dict,
+                                 const gin_helper::Dictionary& dict,
                                  v8::Isolate* isolate,
                                  v8::Local<v8::Value> response);
   static void StartLoadingFile(network::mojom::URLLoaderRequest loader,
                                network::ResourceRequest request,
                                network::mojom::URLLoaderClientPtr client,
                                network::ResourceResponseHead head,
-                               const mate::Dictionary& dict,
+                               const gin_helper::Dictionary& dict,
                                v8::Isolate* isolate,
                                v8::Local<v8::Value> response);
   static void StartLoadingHttp(
@@ -85,11 +85,11 @@ class AtomURLLoaderFactory : public network::mojom::URLLoaderFactory {
       const network::ResourceRequest& original_request,
       network::mojom::URLLoaderClientPtr client,
       const net::MutableNetworkTrafficAnnotationTag& traffic_annotation,
-      const mate::Dictionary& dict);
+      const gin_helper::Dictionary& dict);
   static void StartLoadingStream(network::mojom::URLLoaderRequest loader,
                                  network::mojom::URLLoaderClientPtr client,
                                  network::ResourceResponseHead head,
-                                 const mate::Dictionary& dict);
+                                 const gin_helper::Dictionary& dict);
 
   // Helper to send string as response.
   static void SendContents(network::mojom::URLLoaderClientPtr client,
diff --git a/shell/common/api/atom_api_key_weak_map.h b/shell/common/api/atom_api_key_weak_map.h
index 37d20aa34f7b..159d0596a053 100644
--- a/shell/common/api/atom_api_key_weak_map.h
+++ b/shell/common/api/atom_api_key_weak_map.h
@@ -61,22 +61,4 @@ class KeyWeakMap : public mate::Wrappable<KeyWeakMap<K>> {
 
 }  // namespace electron
 
-namespace gin {
-
-// TODO(zcbenz): Remove this after converting KeyWeakMap to gin::Wrapper.
-template <typename T>
-struct Converter<electron::api::KeyWeakMap<T>*> {
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     electron::api::KeyWeakMap<T>** out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   electron::api::KeyWeakMap<T>* in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-};
-
-}  // namespace gin
-
 #endif  // SHELL_COMMON_API_ATOM_API_KEY_WEAK_MAP_H_
diff --git a/shell/common/api/atom_api_v8_util.cc b/shell/common/api/atom_api_v8_util.cc
index 786d20d7e6b9..67e4ad73be0f 100644
--- a/shell/common/api/atom_api_v8_util.cc
+++ b/shell/common/api/atom_api_v8_util.cc
@@ -8,7 +8,6 @@
 #include "base/hash/hash.h"
 #include "electron/buildflags/buildflags.h"
 #include "shell/common/gin_converters/gurl_converter.h"
-#include "shell/common/gin_converters/native_mate_handle_converter.h"
 #include "shell/common/gin_helper/dictionary.h"
 #include "shell/common/node_includes.h"
 #include "url/origin.h"
diff --git a/shell/common/gin_converters/native_mate_handle_converter.h b/shell/common/gin_converters/native_mate_handle_converter.h
deleted file mode 100644
index 66f30b745baa..000000000000
--- a/shell/common/gin_converters/native_mate_handle_converter.h
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright (c) 2019 GitHub, Inc.
-// Use of this source code is governed by the MIT license that can be
-// found in the LICENSE file.
-
-#ifndef SHELL_COMMON_GIN_CONVERTERS_NATIVE_MATE_HANDLE_CONVERTER_H_
-#define SHELL_COMMON_GIN_CONVERTERS_NATIVE_MATE_HANDLE_CONVERTER_H_
-
-#include "gin/converter.h"
-#include "native_mate/handle.h"
-
-namespace gin {
-
-// TODO(zcbenz): Remove this converter after native_mate is removed.
-
-template <typename T>
-struct Converter<mate::Handle<T>> {
-  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
-                                   const mate::Handle<T>& in) {
-    return mate::ConvertToV8(isolate, in);
-  }
-  static bool FromV8(v8::Isolate* isolate,
-                     v8::Local<v8::Value> val,
-                     mate::Handle<T>* out) {
-    return mate::ConvertFromV8(isolate, val, out);
-  }
-};
-
-}  // namespace gin
-
-#endif  // SHELL_COMMON_GIN_CONVERTERS_NATIVE_MATE_HANDLE_CONVERTER_H_
diff --git a/shell/common/gin_helper/dictionary.h b/shell/common/gin_helper/dictionary.h
index cdba33d89e0f..05fdb4e35c9f 100644
--- a/shell/common/gin_helper/dictionary.h
+++ b/shell/common/gin_helper/dictionary.h
@@ -27,6 +27,23 @@ class Dictionary : public gin::Dictionary {
   Dictionary(const gin::Dictionary& dict)  // NOLINT(runtime/explicit)
       : gin::Dictionary(dict) {}
 
+  // Difference from the Get method in gin::Dictionary:
+  // 1. This is a const method;
+  // 2. It checks whether the key exists before reading.
+  template <typename T>
+  bool Get(base::StringPiece key, T* out) const {
+    // Check for existence before getting, otherwise this method will always
+    // returns true when T == v8::Local<v8::Value>.
+    v8::Local<v8::Context> context = isolate()->GetCurrentContext();
+    v8::Local<v8::String> v8_key = gin::StringToV8(isolate(), key);
+    v8::Local<v8::Value> value;
+    v8::Maybe<bool> result = GetHandle()->Has(context, v8_key);
+    if (result.IsJust() && result.FromJust() &&
+        GetHandle()->Get(context, v8_key).ToLocal(&value))
+      return gin::ConvertFromV8(isolate(), value, out);
+    return false;
+  }
+
   template <typename T>
   bool GetHidden(base::StringPiece key, T* out) const {
     v8::Local<v8::Context> context = isolate()->GetCurrentContext();
@@ -80,6 +97,8 @@ class Dictionary : public gin::Dictionary {
     return !result.IsNothing() && result.FromJust();
   }
 
+  bool IsEmpty() const { return isolate() == nullptr || GetHandle().IsEmpty(); }
+
   v8::Local<v8::Object> GetHandle() const {
     return gin::ConvertToV8(isolate(),
                             *static_cast<const gin::Dictionary*>(this))