electron/patches/common/chromium/web_contents.patch

diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 018534073da1..48f3d0e7343b 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1759,6 +1759,12 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
   std::string unique_name;
   frame_tree_.root()->SetFrameName(params.main_frame_name, unique_name);
 
+  if (params.view && params.delegate_view) {
+    view_.reset(params.view);
+    render_view_host_delegate_view_ = params.delegate_view;
+  }
+
+  if (!view_) {
   WebContentsViewDelegate* delegate =
       GetContentClient()->browser()->GetWebContentsViewDelegate(this);
 
@@ -1774,6 +1780,7 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
           &render_view_host_delegate_view_);
     }
   }
+  }  //  !view_
   CHECK(render_view_host_delegate_view_);
   CHECK(view_.get());
 
diff --git a/content/browser/web_contents/web_contents_view_guest.cc b/content/browser/web_contents/web_contents_view_guest.cc
index 699570cc1390..454830098cb9 100644
--- a/content/browser/web_contents/web_contents_view_guest.cc
+++ b/content/browser/web_contents/web_contents_view_guest.cc
@@ -67,21 +67,27 @@ gfx::NativeWindow WebContentsViewGuest::GetTopLevelNativeWindow() const {
 
 void WebContentsViewGuest::OnGuestAttached(WebContentsView* parent_view) {
 #if defined(USE_AURA)
+  if (!platform_view_->GetNativeView())
+    return;
   // In aura, ScreenPositionClient doesn't work properly if we do
   // not have the native view associated with this WebContentsViewGuest in the
   // view hierarchy. We add this view as embedder's child here.
   // This would go in WebContentsViewGuest::CreateView, but that is too early to
   // access embedder_web_contents(). Therefore, we do it here.
   if (!base::FeatureList::IsEnabled(features::kMash))
-    parent_view->GetNativeView()->AddChild(platform_view_->GetNativeView());
+    if (parent_view->GetNativeView() != platform_view_->GetNativeView())
+      parent_view->GetNativeView()->AddChild(platform_view_->GetNativeView());
 #endif  // defined(USE_AURA)
 }
 
 void WebContentsViewGuest::OnGuestDetached(WebContentsView* old_parent_view) {
 #if defined(USE_AURA)
+  if (!platform_view_->GetNativeView())
+    return;
   if (!base::FeatureList::IsEnabled(features::kMash)) {
-    old_parent_view->GetNativeView()->RemoveChild(
-        platform_view_->GetNativeView());
+    if (old_parent_view->GetNativeView() != platform_view_->GetNativeView())
+      old_parent_view->GetNativeView()->RemoveChild(
+          platform_view_->GetNativeView());
   }
 #endif  // defined(USE_AURA)
 }
@@ -146,11 +152,22 @@ RenderWidgetHostViewBase* WebContentsViewGuest::CreateViewForWidget(
         render_widget_host->GetView());
   }
 
+  RenderWidgetHost* embedder_render_widget_host =
+    guest_->embedder_web_contents()->GetRenderViewHost()->GetWidget();
+  RenderWidgetHostViewBase* embedder_render_widget_host_view =
+      static_cast<RenderWidgetHostViewBase*>(
+        embedder_render_widget_host->GetView());
   RenderWidgetHostViewBase* platform_widget =
-      platform_view_->CreateViewForWidget(render_widget_host, true);
-
-  return RenderWidgetHostViewGuest::Create(render_widget_host, guest_,
-                                           platform_widget->GetWeakPtr());
+      embedder_render_widget_host_view->CreateViewForWidget(
+        render_widget_host,
+        embedder_render_widget_host,
+        platform_view_.get());
+  RenderWidgetHostViewGuest* guest_view = RenderWidgetHostViewGuest::Create(
+    render_widget_host, guest_, platform_widget->GetWeakPtr());
+  platform_widget->InitAsGuest(embedder_render_widget_host->GetView(),
+                               guest_view);
+
+  return guest_view;
 }
 
 RenderWidgetHostViewBase* WebContentsViewGuest::CreateViewForPopupWidget(
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index a13db5f4dd61..621124decfdc 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -69,9 +69,12 @@ class BrowserPluginGuestDelegate;
 class InterstitialPage;
 class RenderFrameHost;
 class RenderViewHost;
+class RenderViewHostDelegateView;
 class RenderWidgetHost;
 class RenderWidgetHostView;
+class RenderWidgetHostViewBase;
 class WebContentsDelegate;
+class WebContentsView;
 struct CustomContextMenuContext;
 struct DropData;
 struct Manifest;
@@ -172,6 +175,10 @@ class WebContents : public PageNavigator,
     // navigation requires a dedicated or privileged process, such as a WebUI.
     bool initialize_renderer;
 
+    // Optionally specify the view and delegate view.
+    content::WebContentsView* view = nullptr;
+    content::RenderViewHostDelegateView* delegate_view = nullptr;
+
     // Sandboxing flags set on the new WebContents.
     blink::WebSandboxFlags starting_sandbox_flags;
   };