Make RenderWidgetHostViewAura::CopyFromCompositingSurface readback layer

content/browser/renderer_host/render_widget_host_impl.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 482 matching lines @@
   // Suppreses future char events until a keydown. See
   // suppress_next_char_events_.
   void SuppressNextCharEvents();
 
   // Indicates whether the renderer drives the RenderWidgetHosts's size or the
   // other way around.
   bool should_auto_resize() { return should_auto_resize_; }
 
   void ComputeTouchLatency(const ui::LatencyInfo& latency_info);
   void FrameSwapped(const ui::LatencyInfo& latency_info);
+  void DidReceieveRendererFrame();
 
   // Returns the ID that uniquely describes this component to the latency
   // subsystem.
   int64 GetLatencyComponentId();
 
   static void CompositorFrameDrawn(const ui::LatencyInfo& latency_info);
 
   // Don't check whether we expected a resize ack during layout tests.
   static void DisableResizeAckCheckForTesting();
 
@@ skipping 113 matching lines @@
 
   // IPC message handlers
   void OnRenderViewReady();
   void OnRenderViewGone(int status, int error_code);
   void OnClose();
   void OnUpdateScreenRectsAck();
   void OnRequestMove(const gfx::Rect& pos);
   void OnSetTooltipText(const string16& tooltip_text,
                         WebKit::WebTextDirection text_direction_hint);
   void OnPaintAtSizeAck(int tag, const gfx::Size& size);
+#if defined(OS_MACOSX)
   void OnCompositorSurfaceBuffersSwapped(
       const ViewHostMsg_CompositorSurfaceBuffersSwapped_Params& params);
+#endif
   bool OnSwapCompositorFrame(const IPC::Message& message);
   void OnOverscrolled(gfx::Vector2dF accumulated_overscroll,
                       gfx::Vector2dF current_fling_velocity);
   void OnUpdateRect(const ViewHostMsg_UpdateRect_Params& params);
   void OnUpdateIsDelayed();
   void OnInputEventAck(WebKit::WebInputEvent::Type event_type,
                        InputEventAckState ack_result);
   void OnBeginSmoothScroll(
       const ViewHostMsg_BeginSmoothScroll_Params& params);
   void OnSelectRangeAck();
@@ skipping 294 matching lines @@
   int64 last_input_number_;
 
   BrowserRenderingStats rendering_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_