cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

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 150 matching lines @@
   // Called when a plugin is moved.  These events are queued up and sent with
   // the next paint or scroll message to the host.
   void SchedulePluginMove(const webkit::npapi::WebPluginGeometry& move);
 
   // 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 WebRenderingStatsImpl 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::WebRenderingStatsImpl&) 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;
 
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface();
 
@@ skipping 504 matching lines @@
   bool is_threaded_compositing_enabled_;
 
   base::WeakPtrFactory<RenderWidget> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_