Plumbing for rendering stats subscriber.

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 <deque>
 #include <map>
 
@@ skipping 135 matching lines @@
 
   // Called when a plugin window has been destroyed, to make sure the currently
   // pending moves don't try to reference it.
   void CleanupWindowInPluginMoves(gfx::PluginWindowHandle window);
 
   // Fills in a WebRenderingStats struct containing information about
   // rendering, e.g. count of frames rendered, time spent painting.
   // This call is relatively expensive in threaded compositing mode,
   // as it blocks on the compositor thread.
   void GetRenderingStats(WebKit::WebRenderingStats&) const;
+  void StartRecordingRenderingStats() const { }
+  void StopRecordingRenderingStats(WebKit::WebRenderingStats&) const;
 
   // Fills in a GpuRenderingStats struct containing information about
   // GPU rendering, e.g. count of texture uploads performed, time spent
   // uploading.
   // This call is relatively expensive as it blocks on the GPU process
   bool GetGpuRenderingStats(GpuRenderingStats*) const;
 
   // Callback for use with BeginSmoothScroll.
   typedef base::Callback<void()> SmoothScrollCompletionCallback;
 
@@ skipping 444 matching lines @@
 
   // Specified whether the compositor will run in its own thread.
   bool is_threaded_compositing_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_