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

android_webview/renderer/aw_render_frame_ext.h

 // 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 ANDROID_WEBVIEW_RENDERER_AW_RENDER_FRAME_EXT_H_
 #define ANDROID_WEBVIEW_RENDERER_AW_RENDER_FRAME_EXT_H_
 
 #include "base/macros.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/geometry/size_f.h"
 
 namespace blink {
 enum WebMeaningfulLayout;
+class WebFrameWidget;
 class WebView;
 }
 
 namespace android_webview {
 
 // Render process side of AwRenderViewHostExt, this provides cross-process
 // implementation of miscellaneous WebView functions that we need to poke
 // WebKit directly to implement (and that aren't needed in the chrome app).
 class AwRenderFrameExt : public content::RenderFrameObserver {
  public:
@@ skipping 17 matching lines @@
 
   void OnResetScrollAndScaleState();
 
   void OnSetInitialPageScale(double page_scale_factor);
 
   void OnSetBackgroundColor(SkColor c);
 
   void OnSmoothScroll(int target_x, int target_y, int duration_ms);
 
   blink::WebView* GetWebView();
+  blink::WebFrameWidget* GetWebFrameWidget();
 
   DISALLOW_COPY_AND_ASSIGN(AwRenderFrameExt);
 };
 
 }
 
 #endif  // ANDROID_WEBVIEW_RENDERER_AW_RENDER_FRAME_EXT_H_