Prepare RenderFrameProxy for mirroring the frame tree

content/renderer/child_frame_compositing_helper.h

Index: content/renderer/child_frame_compositing_helper.h
diff --git a/content/renderer/child_frame_compositing_helper.h b/content/renderer/child_frame_compositing_helper.h
index d66ae3f7cd821486d83d80864a359a24413a1700..8587cd097a36c19933c25af59caaa194a21d7203 100644
--- a/content/renderer/child_frame_compositing_helper.h
+++ b/content/renderer/child_frame_compositing_helper.h
@@ -59,9 +59,7 @@ class CONTENT_EXPORT ChildFrameCompositingHelper
   static ChildFrameCompositingHelper* CreateCompositingHelperForBrowserPlugin(
       const base::WeakPtr<BrowserPlugin>& browser_plugin);
   static ChildFrameCompositingHelper* CreateCompositingHelperForRenderFrame(

[dcheng, 2014/07/03 05:58:54]

It seems kind of weird that this function ends with "ForRenderFrame" but we pass
in a RenderFrameProxy. Is there a reason for the current naming scheme?

[ncarter (slow), 2014/07/14 17:35:07]

Done.

-      blink::WebFrame* frame,
-      RenderFrameProxy* render_frame_proxy,
-      int host_routing_id);
+      RenderFrameProxy* render_frame_proxy);
 
   void CopyFromCompositingSurface(int request_id,
                                   gfx::Rect source_rect,