Sets a transparent background for out-of-process subframes.

content/renderer/render_widget.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 40 matching lines @@
 #include "ui/gfx/range/range.h"
 #include "ui/surface/transport_dib.h"
 
 namespace IPC {
 class SyncMessage;
 class SyncMessageFilter;
 }
 
 namespace blink {
 struct WebDeviceEmulationParams;
+class WebFrameWidget;
 class WebGestureEvent;
 class WebLocalFrame;
 class WebMouseEvent;
 class WebNode;
 struct WebPoint;
 }
 
 namespace cc {
 class OutputSurface;
 class SwapPromise;
@@ skipping 296 matching lines @@
 
   RenderWidget(CompositorDependencies* compositor_deps,
                blink::WebPopupType popup_type,
                const blink::WebScreenInfo& screen_info,
                bool swapped_out,
                bool hidden,
                bool never_visible);
 
   ~RenderWidget() override;
 
-  static blink::WebWidget* CreateWebFrameWidget(RenderWidget* render_widget,
-                                                blink::WebLocalFrame* frame);
+  static blink::WebFrameWidget* CreateWebFrameWidget(
+      RenderWidget* render_widget,
+      blink::WebLocalFrame* frame);
 
   // Creates a WebWidget based on the popup type.
   static blink::WebWidget* CreateWebWidget(RenderWidget* render_widget);
 
   // Initializes this view with the given opener.
   bool Init(int32_t opener_id);
 
   // Called by Init and subclasses to perform initialization.
   bool DoInit(int32_t opener_id,
               blink::WebWidget* web_widget,
@@ skipping 368 matching lines @@
 
   scoped_ptr<scheduler::RenderWidgetSchedulingState>
       render_widget_scheduling_state_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_