fix: explicitly call GetNativeNSView() on macOS (#46733)

* fix: explicitly call GetNativeNSView() on macOS

* chore: move macOS impl to a .mm file

This is needed in order to access gfx::NativeView::GetNativeNSView()

filenames.gni

@@ -125,6 +125,7 @@ filenames = {
     "shell/browser/animation_util.h",
     "shell/browser/animation_util_mac.mm",
     "shell/browser/api/electron_api_app_mac.mm",
+    "shell/browser/api/electron_api_base_window_mac.mm",
     "shell/browser/api/electron_api_menu_mac.h",
     "shell/browser/api/electron_api_menu_mac.mm",
     "shell/browser/api/electron_api_native_theme_mac.mm",

shell/browser/api/electron_api_base_window.cc

@@ -70,6 +70,7 @@ namespace electron::api {
 
 namespace {
 
+#if !BUILDFLAG(IS_MAC)
 // Converts binary data to Buffer.
 v8::Local<v8::Value> ToBuffer(v8::Isolate* isolate, void* val, int size) {
   auto buffer = node::Buffer::Copy(isolate, static_cast<char*>(val), size);
@@ -78,6 +79,7 @@ v8::Local<v8::Value> ToBuffer(v8::Isolate* isolate, void* val, int size) {
   else
     return buffer.ToLocalChecked();
 }
+#endif
 
 [[nodiscard]] constexpr std::array<int, 2U> ToArray(const gfx::Size size) {
   return {size.width(), size.height()};
@@ -778,6 +780,7 @@ std::string BaseWindow::GetMediaSourceId() const {
   return window_->GetDesktopMediaID().ToString();
 }
 
+#if !BUILDFLAG(IS_MAC)
 v8::Local<v8::Value> BaseWindow::GetNativeWindowHandle() {
   // TODO(MarshallOfSound): Replace once
   // https://chromium-review.googlesource.com/c/chromium/src/+/1253094/ has
@@ -785,6 +788,7 @@ v8::Local<v8::Value> BaseWindow::GetNativeWindowHandle() {
   NativeWindowHandle handle = window_->GetNativeWindowHandle();
   return ToBuffer(isolate(), &handle, sizeof(handle));
 }
+#endif
 
 void BaseWindow::SetProgressBar(double progress, gin_helper::Arguments* args) {
   gin_helper::Dictionary options;

shell/browser/api/electron_api_base_window_mac.mm

@@ -0,0 +1,32 @@
+// Copyright (c) 2025 Microsoft, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "shell/browser/api/electron_api_base_window.h"
+
+#include "electron/buildflags/buildflags.h"
+#include "shell/browser/api/electron_api_view.h"
+#include "shell/browser/native_window.h"
+#include "shell/common/node_includes.h"
+
+namespace {
+
+// Converts binary data to Buffer.
+v8::Local<v8::Value> ToBuffer(v8::Isolate* isolate, void* val, int size) {
+  auto buffer = node::Buffer::Copy(isolate, static_cast<char*>(val), size);
+  if (buffer.IsEmpty())
+    return v8::Null(isolate);
+  else
+    return buffer.ToLocalChecked();
+}
+
+}  // namespace
+
+namespace electron::api {
+
+v8::Local<v8::Value> BaseWindow::GetNativeWindowHandle() {
+  NSView* handle = window_->GetNativeWindowHandle().GetNativeNSView();
+  return ToBuffer(isolate(), &handle, sizeof(handle));
+}
+
+}  // namespace electron::api

shell/browser/api/electron_api_web_contents.cc

@@ -3743,15 +3743,17 @@ void WebContents::SetDevToolsWebContents(const WebContents* devtools) {
     inspectable_web_contents_->SetDevToolsWebContents(devtools->web_contents());
 }
 
+#if !BUILDFLAG(IS_MAC)
 v8::Local<v8::Value> WebContents::GetNativeView(v8::Isolate* isolate) const {
   gfx::NativeView ptr = web_contents()->GetNativeView();
-  auto buffer = node::Buffer::Copy(isolate, reinterpret_cast<char*>(&ptr),
-                                   sizeof(gfx::NativeView));
+  auto buffer =
+      node::Buffer::Copy(isolate, reinterpret_cast<char*>(&ptr), sizeof(ptr));
   if (buffer.IsEmpty())
     return v8::Null(isolate);
   else
     return buffer.ToLocalChecked();
 }
+#endif
 
 v8::Local<v8::Value> WebContents::DevToolsWebContents(v8::Isolate* isolate) {
   if (devtools_web_contents_.IsEmpty())

shell/browser/api/electron_api_web_contents_mac.mm

@@ -6,6 +6,7 @@
 #include "shell/browser/api/electron_api_web_contents.h"
 #include "shell/browser/ui/cocoa/event_dispatching_window.h"
 #include "shell/browser/web_contents_preferences.h"
+#include "shell/common/node_includes.h"
 #include "ui/base/cocoa/command_dispatcher.h"
 #include "ui/base/cocoa/nsmenu_additions.h"
 #include "ui/base/cocoa/nsmenuitem_additions.h"
@@ -92,4 +93,22 @@ bool WebContents::PlatformHandleKeyboardEvent(
   return false;
 }
 
+namespace {
+
+// Converts binary data to Buffer.
+v8::Local<v8::Value> ToBuffer(v8::Isolate* isolate, void* val, int size) {
+  auto buffer = node::Buffer::Copy(isolate, static_cast<char*>(val), size);
+  if (buffer.IsEmpty())
+    return v8::Null(isolate);
+  else
+    return buffer.ToLocalChecked();
+}
+
+}  // namespace
+
+v8::Local<v8::Value> WebContents::GetNativeView(v8::Isolate* isolate) const {
+  NSView* handle = web_contents()->GetNativeView().GetNativeNSView();
+  return ToBuffer(isolate, &handle, sizeof(handle));
+}
+
 }  // namespace electron::api

shell/browser/native_window.h

@@ -58,9 +58,9 @@ class BrowserView;
 }
 
 #if BUILDFLAG(IS_MAC)
-typedef gfx::NativeView NativeWindowHandle;
+using NativeWindowHandle = gfx::NativeView;
 #else
-typedef gfx::AcceleratedWidget NativeWindowHandle;
+using NativeWindowHandle = gfx::AcceleratedWidget;
 #endif
 
 class NativeWindow : public base::SupportsUserData,