Place DevTools WebContents underneath inspected WebContents.

This commit has this strategy implemented on Mac.

See https://code.google.com/p/chromium/issues/detail?id=318751.

brightray/brightray.gyp

@@ -40,6 +40,8 @@
         'browser/default_web_contents_delegate.cc',
         'browser/default_web_contents_delegate.h',
         'browser/default_web_contents_delegate_mac.mm',
+        'browser/devtools_contents_resizing_strategy.cc',
+        'browser/devtools_contents_resizing_strategy.h',
         'browser/devtools_embedder_message_dispatcher.cc',
         'browser/devtools_embedder_message_dispatcher.h',
         'browser/devtools_ui.cc',

brightray/browser/devtools_contents_resizing_strategy.cc

@@ -0,0 +1,85 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "browser/devtools_contents_resizing_strategy.h"
+
+#include <algorithm>
+
+DevToolsContentsResizingStrategy::DevToolsContentsResizingStrategy() {
+}
+
+DevToolsContentsResizingStrategy::DevToolsContentsResizingStrategy(
+    const gfx::Insets& insets, const gfx::Size& min_size)
+    : insets_(insets),
+      min_size_(min_size) {
+}
+
+DevToolsContentsResizingStrategy::DevToolsContentsResizingStrategy(
+    const gfx::Rect& bounds)
+    : bounds_(bounds) {
+}
+
+
+void DevToolsContentsResizingStrategy::CopyFrom(
+    const DevToolsContentsResizingStrategy& strategy) {
+  insets_ = strategy.insets();
+  min_size_ = strategy.min_size();
+  bounds_ = strategy.bounds();
+}
+
+bool DevToolsContentsResizingStrategy::Equals(
+    const DevToolsContentsResizingStrategy& strategy) {
+  return insets_ == strategy.insets() && min_size_ == strategy.min_size() &&
+      bounds_ == strategy.bounds();
+}
+
+void ApplyDevToolsContentsResizingStrategy(
+    const DevToolsContentsResizingStrategy& strategy,
+    const gfx::Size& container_size,
+    const gfx::Rect& old_devtools_bounds,
+    const gfx::Rect& old_contents_bounds,
+    gfx::Rect* new_devtools_bounds,
+    gfx::Rect* new_contents_bounds) {
+  new_devtools_bounds->SetRect(
+      0, 0, container_size.width(), container_size.height());
+
+  const gfx::Insets& insets = strategy.insets();
+  const gfx::Size& min_size = strategy.min_size();
+  const gfx::Rect& bounds = strategy.bounds();
+
+  if (!bounds.size().IsEmpty()) {
+    int left = std::min(bounds.x(), container_size.width());
+    int top = std::min(bounds.y(), container_size.height());
+    int width = std::min(bounds.width(), container_size.width() - left);
+    int height = std::min(bounds.height(), container_size.height() - top);
+    new_contents_bounds->SetRect(left, top, width, height);
+    return;
+  }
+
+  int width = std::max(0, container_size.width() - insets.width());
+  int left = insets.left();
+  if (width < min_size.width() && insets.width() > 0) {
+    int min_width = std::min(min_size.width(), container_size.width());
+    int insets_width = container_size.width() - min_width;
+    int insets_decrease = insets.width() - insets_width;
+    // Decrease both left and right insets proportionally.
+    left -= insets_decrease * insets.left() / insets.width();
+    width = min_width;
+  }
+  left = std::max(0, std::min(container_size.width(), left));
+
+  int height = std::max(0, container_size.height() - insets.height());
+  int top = insets.top();
+  if (height < min_size.height() && insets.height() > 0) {
+    int min_height = std::min(min_size.height(), container_size.height());
+    int insets_height = container_size.height() - min_height;
+    int insets_decrease = insets.height() - insets_height;
+    // Decrease both top and bottom insets proportionally.
+    top -= insets_decrease * insets.top() / insets.height();
+    height = min_height;
+  }
+  top = std::max(0, std::min(container_size.height(), top));
+
+  new_contents_bounds->SetRect(left, top, width, height);
+}

brightray/browser/devtools_contents_resizing_strategy.h

@@ -0,0 +1,56 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BRIGHTRAY_BROWSER_DEVTOOLS_CONTENTS_RESIZING_STRATEGY_H_
+#define BRIGHTRAY_BROWSER_DEVTOOLS_CONTENTS_RESIZING_STRATEGY_H_
+
+#include "base/basictypes.h"
+#include "ui/gfx/insets.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
+
+// This class knows how to resize both DevTools and inspected WebContents
+// inside a browser window hierarchy.
+class DevToolsContentsResizingStrategy {
+ public:
+  DevToolsContentsResizingStrategy();
+  DevToolsContentsResizingStrategy(
+      const gfx::Insets& insets,
+      const gfx::Size& min_size);
+  explicit DevToolsContentsResizingStrategy(const gfx::Rect& bounds);
+
+  void CopyFrom(const DevToolsContentsResizingStrategy& strategy);
+  bool Equals(const DevToolsContentsResizingStrategy& strategy);
+
+  const gfx::Insets& insets() const { return insets_; }
+  const gfx::Size& min_size() const { return min_size_; }
+  const gfx::Rect& bounds() const { return bounds_; }
+
+ private:
+  // Insets of contents inside DevTools.
+  gfx::Insets insets_;
+
+  // Minimum size of contents.
+  gfx::Size min_size_;
+
+  // Contents bounds. When non-empty, used instead of insets.
+  gfx::Rect bounds_;
+
+  DISALLOW_COPY_AND_ASSIGN(DevToolsContentsResizingStrategy);
+};
+
+// Applies contents resizing strategy, producing bounds for devtools and
+// page contents views. Generally, page contents view is placed atop of devtools
+// inside a common parent view, which size should be passed in |container_size|.
+// When unknown, providing empty rect as previous devtools and contents bounds
+// is allowed.
+void ApplyDevToolsContentsResizingStrategy(
+    const DevToolsContentsResizingStrategy& strategy,
+    const gfx::Size& container_size,
+    const gfx::Rect& old_devtools_bounds,
+    const gfx::Rect& old_contents_bounds,
+    gfx::Rect* new_devtools_bounds,
+    gfx::Rect* new_contents_bounds);
+
+#endif  // BRIGHTRAY_BROWSER_DEVTOOLS_CONTENTS_RESIZING_STRATEGY_H_

brightray/browser/devtools_embedder_message_dispatcher.cc

@@ -27,6 +27,36 @@ bool GetValue(const base::ListValue& list, int pos, bool& value) {
   return list.GetBoolean(pos, &value);
 }
 
+bool GetValue(const base::ListValue& list, int pos, gfx::Insets& insets) {
+  const base::DictionaryValue* dict;
+  if (!list.GetDictionary(pos, &dict))
+    return false;
+  int top = 0;
+  int left = 0;
+  int bottom = 0;
+  int right = 0;
+  if (!dict->GetInteger("top", &top) ||
+      !dict->GetInteger("left", &left) ||
+      !dict->GetInteger("bottom", &bottom) ||
+      !dict->GetInteger("right", &right))
+    return false;
+  insets.Set(top, left, bottom, right);
+  return true;
+}
+
+bool GetValue(const base::ListValue& list, int pos, gfx::Size& size) {
+  const base::DictionaryValue* dict;
+  if (!list.GetDictionary(pos, &dict))
+    return false;
+  int width = 0;
+  int height = 0;
+  if (!dict->GetInteger("width", &width) ||
+      !dict->GetInteger("height", &height))
+    return false;
+  size.SetSize(width, height);
+  return true;
+}
+
 template <typename T>
 struct StorageTraits {
   typedef T StorageType;
@@ -105,6 +135,28 @@ bool ParseAndHandle3(const base::Callback<void(A1, A2, A3)>& handler,
   return true;
 }
 
+template <class A1, class A2, class A3, class A4>
+bool ParseAndHandle3(const base::Callback<void(A1, A2, A3, A4)>& handler,
+                     const base::ListValue& list) {
+  if (list.GetSize() != 3)
+    return false;
+  Argument<A1> arg1(list, 0);
+  if (!arg1.valid())
+    return false;
+  Argument<A2> arg2(list, 1);
+  if (!arg2.valid())
+    return false;
+  Argument<A3> arg3(list, 2);
+  if (!arg3.valid())
+    return false;
+  Argument<A4> arg4(list, 3);
+  if (!arg4.valid())
+    return false;
+  handler.Run(arg1.value(), arg2.value(), arg3.value(), arg4.value());
+  return true;
+}
+
+
 typedef base::Callback<bool (const base::ListValue&)> ListValueParser;
 
 ListValueParser BindToListParser(const base::Callback<void()>& handler) {
@@ -127,6 +179,12 @@ ListValueParser BindToListParser(
   return base::Bind(&ParseAndHandle3<A1, A2, A3>, handler);
 }
 
+template <class A1, class A2, class A3, class A4>
+ListValueParser BindToListParser(
+    const base::Callback<void(A1, A2, A3, A4)>& handler) {
+  return base::Bind(&ParseAndHandle3<A1, A2, A3, A4>, handler);
+}
+
 }  // namespace
 
 DevToolsEmbedderMessageDispatcher::DevToolsEmbedderMessageDispatcher(
@@ -137,11 +195,14 @@ DevToolsEmbedderMessageDispatcher::DevToolsEmbedderMessageDispatcher(
   RegisterHandler("closeWindow",
       BindToListParser(base::Bind(&Delegate::CloseWindow,
                                   base::Unretained(delegate))));
+  RegisterHandler("setContentsResizingStrategy",
+      BindToListParser(base::Bind(&Delegate::SetContentsResizingStrategy,
+                                  base::Unretained(delegate))));
   RegisterHandler("moveWindowBy",
       BindToListParser(base::Bind(&Delegate::MoveWindow,
                                   base::Unretained(delegate))));
-  RegisterHandler("requestSetDockSide",
-      BindToListParser(base::Bind(&Delegate::SetDockSide,
+  RegisterHandler("setIsDocked",
+      BindToListParser(base::Bind(&Delegate::SetIsDocked,
                                   base::Unretained(delegate))));
   RegisterHandler("openInNewTab",
       BindToListParser(base::Bind(&Delegate::OpenInNewTab,

brightray/browser/devtools_embedder_message_dispatcher.h

@@ -9,6 +9,8 @@
 #include <string>
 
 #include "base/callback.h"
+#include "ui/gfx/insets.h"
+#include "ui/gfx/size.h"
 
 namespace base {
 class ListValue;
@@ -30,8 +32,10 @@ class DevToolsEmbedderMessageDispatcher {
 
     virtual void ActivateWindow() = 0;
     virtual void CloseWindow() = 0;
+    virtual void SetContentsResizingStrategy(
+        const gfx::Insets& insets, const gfx::Size& min_size) = 0;
     virtual void MoveWindow(int x, int y) = 0;
-    virtual void SetDockSide(const std::string& side) = 0;
+    virtual void SetIsDocked(bool docked) = 0;
     virtual void OpenInNewTab(const std::string& url) = 0;
     virtual void SaveToFile(const std::string& url,
                             const std::string& content,

brightray/browser/inspectable_web_contents_delegate.h

@@ -9,18 +9,6 @@ class InspectableWebContentsDelegate {
  public:
   virtual ~InspectableWebContentsDelegate() {}
 
-  // Called when the devtools is going to change the dock side, returning true
-  // to override the default behavior.
-  // Receiver should set |succeed| to |false| if it failed to handle this.
-  virtual bool DevToolsSetDockSide(const std::string& side, bool* succeed) {
-    return false;
-  }
-
-  // Called when the devtools is going to be showed, returning true to override
-  // the default behavior.
-  // Receiver is given the chance to change the |dock_side|.
-  virtual bool DevToolsShow(std::string* dock_side) { return false; }
-
   // Requested by WebContents of devtools.
   virtual void DevToolsSaveToFile(
       const std::string& url, const std::string& content, bool save_as) {}

brightray/browser/inspectable_web_contents_impl.cc

@@ -26,8 +26,8 @@ namespace brightray {
 
 namespace {
 
-const char kChromeUIDevToolsURL[] = "chrome-devtools://devtools/devtools.html";
-const char kDockSidePref[] = "brightray.devtools.dockside";
+const char kChromeUIDevToolsURL[] = "chrome-devtools://devtools/devtools.html?can_dock=true";
+const char kIsDockedPref[] = "brightray.devtools.isDocked";
 
 }
 
@@ -36,7 +36,7 @@ InspectableWebContentsView* CreateInspectableContentsView(
     InspectableWebContentsImpl* inspectable_web_contents_impl);
 
 void InspectableWebContentsImpl::RegisterPrefs(PrefRegistrySimple* registry) {
-  registry->RegisterStringPref(kDockSidePref, "bottom");
+  registry->RegisterBooleanPref(kIsDockedPref, true);
 }
 
 InspectableWebContentsImpl::InspectableWebContentsImpl(
@@ -45,7 +45,7 @@ InspectableWebContentsImpl::InspectableWebContentsImpl(
       delegate_(nullptr) {
   auto context = static_cast<BrowserContext*>(
       web_contents_->GetBrowserContext());
-  dock_side_ = context->prefs()->GetString(kDockSidePref);
+  is_docked_ = context->prefs()->GetBoolean(kIsDockedPref);
 
   view_.reset(CreateInspectableContentsView(this));
 }
@@ -62,6 +62,8 @@ content::WebContents* InspectableWebContentsImpl::GetWebContents() const {
 }
 
 void InspectableWebContentsImpl::ShowDevTools() {
+  // Show devtools only after it has done loading, this is to make sure the
+  // SetIsDocked is called *BEFORE* ShowDevTools.
   if (!devtools_web_contents_) {
     embedder_message_dispatcher_.reset(
         new DevToolsEmbedderMessageDispatcher(this));
@@ -70,11 +72,6 @@ void InspectableWebContentsImpl::ShowDevTools() {
         web_contents_->GetBrowserContext());
     devtools_web_contents_.reset(content::WebContents::Create(create_params));
 
-#if defined(OS_MACOSX)
-    // Work around http://crbug.com/279472.
-    devtools_web_contents_->GetView()->SetAllowOverlappingViews(true);
-#endif
-
     Observe(devtools_web_contents_.get());
     devtools_web_contents_->SetDelegate(this);
 
@@ -92,17 +89,13 @@ void InspectableWebContentsImpl::ShowDevTools() {
         content::Referrer(),
         content::PAGE_TRANSITION_AUTO_TOPLEVEL,
         std::string());
+  } else {
+    view_->ShowDevTools();
   }
-
-  if (delegate_ && delegate_->DevToolsShow(&dock_side_))
-    return;
-
-  view_->SetDockSide(dock_side_);
-  view_->ShowDevTools();
 }
 
 void InspectableWebContentsImpl::CloseDevTools() {
-  if (IsDevToolsViewShowing()) {
+  if (devtools_web_contents_) {
     view_->CloseDevTools();
     devtools_web_contents_.reset();
     web_contents_->GetView()->Focus();
@@ -113,13 +106,6 @@ bool InspectableWebContentsImpl::IsDevToolsViewShowing() {
   return devtools_web_contents_ && view_->IsDevToolsViewShowing();
 }
 
-void InspectableWebContentsImpl::UpdateFrontendDockSide() {
-  auto javascript = base::StringPrintf(
-      "InspectorFrontendAPI.setDockSide(\"%s\")", dock_side_.c_str());
-  devtools_web_contents_->GetRenderViewHost()->ExecuteJavascriptInWebFrame(
-      base::string16(), base::ASCIIToUTF16(javascript));
-}
-
 void InspectableWebContentsImpl::ActivateWindow() {
 }
 
@@ -127,25 +113,26 @@ void InspectableWebContentsImpl::CloseWindow() {
   CloseDevTools();
 }
 
+void InspectableWebContentsImpl::SetContentsResizingStrategy(
+    const gfx::Insets& insets, const gfx::Size& min_size) {
+  DevToolsContentsResizingStrategy strategy(insets, min_size);
+  if (contents_resizing_strategy_.Equals(strategy))
+    return;
+
+  contents_resizing_strategy_.CopyFrom(strategy);
+  view_->SetContentsResizingStrategy(contents_resizing_strategy_);
+}
+
 void InspectableWebContentsImpl::MoveWindow(int x, int y) {
 }
 
-void InspectableWebContentsImpl::SetDockSide(const std::string& side) {
-  bool succeed = true;
-  if (delegate_ && delegate_->DevToolsSetDockSide(side, &succeed)) {
-    if (!succeed)  // delegate failed to set dock side.
-      return;
-  } else if (!view_->SetDockSide(side)) {
-    return;
-  }
-
-  dock_side_ = side;
+void InspectableWebContentsImpl::SetIsDocked(bool docked) {
+  view_->SetIsDocked(docked);
+  is_docked_ = docked;
 
   auto context = static_cast<BrowserContext*>(
       web_contents_->GetBrowserContext());
-  context->prefs()->SetString(kDockSidePref, side);
-
-  UpdateFrontendDockSide();
+  context->prefs()->SetBoolean(kIsDockedPref, docked);
 }
 
 void InspectableWebContentsImpl::OpenInNewTab(const std::string& url) {
@@ -207,7 +194,7 @@ void InspectableWebContentsImpl::DidFinishLoad(int64 frame_id,
   if (!is_main_frame)
     return;
 
-  UpdateFrontendDockSide();
+  view_->ShowDevTools();
 }
 
 void InspectableWebContentsImpl::WebContentsDestroyed(content::WebContents*) {

brightray/browser/inspectable_web_contents_impl.h

@@ -8,6 +8,7 @@
 
 #include "browser/inspectable_web_contents.h"
 
+#include "browser/devtools_contents_resizing_strategy.h"
 #include "browser/devtools_embedder_message_dispatcher.h"
 
 #include "content/public/browser/devtools_frontend_host_delegate.h"
@@ -54,14 +55,14 @@ class InspectableWebContentsImpl :
   }
 
  private:
-  void UpdateFrontendDockSide();
-
   // DevToolsEmbedderMessageDispacher::Delegate
 
   virtual void ActivateWindow() OVERRIDE;
   virtual void CloseWindow() OVERRIDE;
+  virtual void SetContentsResizingStrategy(
+      const gfx::Insets& insets, const gfx::Size& min_size) OVERRIDE;
   virtual void MoveWindow(int x, int y) OVERRIDE;
-  virtual void SetDockSide(const std::string& side) OVERRIDE;
+  virtual void SetIsDocked(bool docked) OVERRIDE;
   virtual void OpenInNewTab(const std::string& url) OVERRIDE;
   virtual void SaveToFile(const std::string& url,
                           const std::string& content,
@@ -103,7 +104,9 @@ class InspectableWebContentsImpl :
   scoped_ptr<content::WebContents> devtools_web_contents_;
   scoped_ptr<InspectableWebContentsView> view_;
   scoped_refptr<content::DevToolsAgentHost> agent_host_;
-  std::string dock_side_;
+
+  bool is_docked_;
+  DevToolsContentsResizingStrategy contents_resizing_strategy_;
 
   scoped_ptr<DevToolsEmbedderMessageDispatcher> embedder_message_dispatcher_;
 

brightray/browser/inspectable_web_contents_view.h

@@ -3,6 +3,8 @@
 
 #include "ui/gfx/native_widget_types.h"
 
+class DevToolsContentsResizingStrategy;
+
 namespace brightray {
 
 class InspectableWebContentsView {
@@ -15,7 +17,9 @@ class InspectableWebContentsView {
   // Hide the DevTools view.
   virtual void CloseDevTools() = 0;
   virtual bool IsDevToolsViewShowing() = 0;
-  virtual bool SetDockSide(const std::string& side) = 0;
+  virtual void SetIsDocked(bool docked) = 0;
+  virtual void SetContentsResizingStrategy(
+      const DevToolsContentsResizingStrategy& strategy) = 0;
 };
 
 }  // namespace brightray

brightray/browser/inspectable_web_contents_view_mac.h

@@ -21,7 +21,9 @@ class InspectableWebContentsViewMac : public InspectableWebContentsView {
   virtual void ShowDevTools() OVERRIDE;
   virtual void CloseDevTools() OVERRIDE;
   virtual bool IsDevToolsViewShowing() OVERRIDE;
-  virtual bool SetDockSide(const std::string& side) OVERRIDE;
+  virtual void SetIsDocked(bool docked) OVERRIDE;
+  virtual void SetContentsResizingStrategy(
+      const DevToolsContentsResizingStrategy& strategy) OVERRIDE;
 
   InspectableWebContentsImpl* inspectable_web_contents() {
     return inspectable_web_contents_;

brightray/browser/inspectable_web_contents_view_mac.mm

@@ -1,10 +1,11 @@
-#import "browser/inspectable_web_contents_view_mac.h"
+#include "browser/inspectable_web_contents_view_mac.h"
 
-#import "browser/inspectable_web_contents.h"
+#import <AppKit/AppKit.h>
+
+#include "browser/inspectable_web_contents.h"
 #import "browser/mac/bry_inspectable_web_contents_view.h"
 
-#import "content/public/browser/web_contents_view.h"
-#import <AppKit/AppKit.h>
+#include "content/public/browser/web_contents_view.h"
 
 namespace brightray {
 
@@ -36,8 +37,13 @@ bool InspectableWebContentsViewMac::IsDevToolsViewShowing() {
   return [view_ isDevToolsVisible];
 }
 
-bool InspectableWebContentsViewMac::SetDockSide(const std::string& side) {
-  return [view_ setDockSide:side];
+void InspectableWebContentsViewMac::SetIsDocked(bool docked) {
+  [view_ setIsDocked:docked];
+}
+
+void InspectableWebContentsViewMac::SetContentsResizingStrategy(
+      const DevToolsContentsResizingStrategy& strategy) {
+  [view_ setContentsResizingStrategy:strategy];
 }
 
 }

brightray/browser/mac/bry_inspectable_web_contents_view.h

@@ -1,24 +1,33 @@
 #import <AppKit/AppKit.h>
 
-#include <string>
+#include "browser/devtools_contents_resizing_strategy.h"
 
 #include "base/mac/scoped_nsobject.h"
+#include "ui/base/cocoa/base_view.h"
+#include "ui/gfx/insets.h"
 
 namespace brightray {
 class InspectableWebContentsViewMac;
 }
 
-@interface BRYInspectableWebContentsView : NSView<NSWindowDelegate> {
+@interface BRYInspectableWebContentsView : BaseView<NSWindowDelegate> {
 @private
   brightray::InspectableWebContentsViewMac* inspectableWebContentsView_;
+
   base::scoped_nsobject<NSWindow> devtools_window_;
   BOOL devtools_visible_;
+  BOOL devtools_docked_;
+
+  DevToolsContentsResizingStrategy strategy_;
 }
 
 - (instancetype)initWithInspectableWebContentsViewMac:(brightray::InspectableWebContentsViewMac*)inspectableWebContentsView;
-- (IBAction)showDevTools:(id)sender;
 - (void)setDevToolsVisible:(BOOL)visible;
 - (BOOL)isDevToolsVisible;
-- (BOOL)setDockSide:(const std::string&)side ;
+- (void)setIsDocked:(BOOL)docked;
+- (void)setContentsResizingStrategy:(const DevToolsContentsResizingStrategy&)strategy;
+
+// Adjust docked devtools to the contents resizing strategy.
+- (void)update;
 
 @end

brightray/browser/mac/bry_inspectable_web_contents_view.mm

@@ -1,11 +1,12 @@
-#import "browser/mac/bry_inspectable_web_contents_view.h"
+#include "browser/mac/bry_inspectable_web_contents_view.h"
 
-#import "browser/inspectable_web_contents_impl.h"
-#import "browser/inspectable_web_contents_view_mac.h"
+#include "browser/inspectable_web_contents_impl.h"
+#include "browser/inspectable_web_contents_view_mac.h"
 
-#import "content/public/browser/render_widget_host_view.h"
-#import "content/public/browser/web_contents_view.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "content/public/browser/web_contents_view.h"
 #import "ui/base/cocoa/underlay_opengl_hosting_window.h"
+#include "ui/gfx/mac/scoped_ns_disable_screen_updates.h"
 
 using namespace brightray;
 
@@ -18,10 +19,12 @@ using namespace brightray;
 
   inspectableWebContentsView_ = inspectableWebContentsView;
   devtools_visible_ = NO;
+  devtools_docked_ = NO;
 
-  auto webView = inspectableWebContentsView->inspectable_web_contents()->GetWebContents()->GetView()->GetNativeView();
-  webView.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
-  [self addSubview:webView];
+  auto contents = inspectableWebContentsView->inspectable_web_contents()->GetWebContents();
+  auto contentsView = contents->GetView()->GetNativeView();
+  [contentsView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
+  [self addSubview:contentsView];
 
   return self;
 }
@@ -30,16 +33,53 @@ using namespace brightray;
   [super dealloc];
 }
 
+- (void)resizeSubviewsWithOldSize:(NSSize)oldBoundsSize {
+  [self adjustSubviews];
+}
+
 - (IBAction)showDevTools:(id)sender {
   inspectableWebContentsView_->inspectable_web_contents()->ShowDevTools();
 }
 
 - (void)setDevToolsVisible:(BOOL)visible {
-  if (devtools_visible_ == visible)
+  if (visible == devtools_visible_)
     return;
-  devtools_visible_ = visible;
 
-  if (!devtools_window_) {
+  auto devToolsWebContents = inspectableWebContentsView_->inspectable_web_contents()->devtools_web_contents();
+  auto devToolsView = devToolsWebContents->GetView()->GetNativeView();
+
+  devtools_visible_ = visible;
+  if (devtools_docked_) {
+    if (visible) {
+      // Place the devToolsView under contentsView, notice that we didn't set
+      // sizes for them until the setContentsResizingStrategy message.
+      [self addSubview:devToolsView positioned:NSWindowBelow relativeTo:nil];
+      [self update];
+    } else {
+      gfx::ScopedNSDisableScreenUpdates disabler;
+      devToolsWebContents->GetView()->RemoveOverlayView();
+      [devToolsView removeFromSuperview];
+      [self adjustSubviews];
+    }
+  } else {
+    if (visible)
+      [devtools_window_ makeKeyAndOrderFront:nil];
+    else
+      devtools_window_.reset();
+  }
+}
+
+- (BOOL)isDevToolsVisible {
+  return devtools_visible_;
+}
+
+- (void)setIsDocked:(BOOL)docked {
+  // Revert to no-devtools state.
+  [self setDevToolsVisible:NO];
+
+  // Switch to new state.
+  devtools_docked_ = docked;
+  if (!docked) {
     auto devToolsWebContents = inspectableWebContentsView_->inspectable_web_contents()->devtools_web_contents();
     auto devToolsView = devToolsWebContents->GetView()->GetNativeView();
 
@@ -65,27 +105,59 @@ using namespace brightray;
 
     [contentView addSubview:devToolsView];
   }
+  [self setDevToolsVisible:YES];
+}
 
-  if (visible) {
-    [devtools_window_ makeKeyAndOrderFront:nil];
-  } else {
-    [devtools_window_ performClose:nil];
+- (void)setContentsResizingStrategy:(const DevToolsContentsResizingStrategy&)strategy {
+  strategy_.CopyFrom(strategy);
+  [self update];
+}
+
+- (void)update {
+  if (!devtools_docked_)
+    return;
+
+  auto contents = inspectableWebContentsView_->inspectable_web_contents()->GetWebContents();
+  auto devToolsWebContents = inspectableWebContentsView_->inspectable_web_contents()->devtools_web_contents();
+
+  gfx::ScopedNSDisableScreenUpdates disabler;
+  devToolsWebContents->GetView()->SetOverlayView(
+      contents->GetView(),
+      gfx::Point(strategy_.insets().left(), strategy_.insets().top()));
+  [self adjustSubviews];
+}
+
+- (void)adjustSubviews {
+  if (![[self subviews] count])
+    return;
+
+  if (![self isDevToolsVisible] || devtools_window_) {
+    DCHECK_EQ(1u, [[self subviews] count]);
+    NSView* contents = [[self subviews] objectAtIndex:0];
+    [contents setFrame:[self bounds]];
+    return;
   }
-}
 
-- (BOOL)isDevToolsVisible {
-  return devtools_visible_;
-}
+  NSView* devToolsView = [[self subviews] objectAtIndex:0];
+  NSView* contentsView = [[self subviews] objectAtIndex:1];
 
-- (BOOL)setDockSide:(const std::string&)side {
-  return NO;
+  DCHECK_EQ(2u, [[self subviews] count]);
+
+  gfx::Rect new_devtools_bounds;
+  gfx::Rect new_contents_bounds;
+  ApplyDevToolsContentsResizingStrategy(
+      strategy_, gfx::Size(NSSizeToCGSize([self bounds].size)),
+      [self flipNSRectToRect:[devToolsView bounds]],
+      [self flipNSRectToRect:[contentsView bounds]],
+      &new_devtools_bounds, &new_contents_bounds);
+  [devToolsView setFrame:[self flipRectToNSRect:new_devtools_bounds]];
+  [contentsView setFrame:[self flipRectToNSRect:new_contents_bounds]];
 }
 
 #pragma mark - NSWindowDelegate
 
 - (void)windowWillClose:(NSNotification*)notification {
-  devtools_visible_ = NO;
-  devtools_window_.reset();
+  inspectableWebContentsView_->inspectable_web_contents()->CloseDevTools();
 }
 
 @end