cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/thread_proxy.h

Index: cc/thread_proxy.h
diff --git a/cc/thread_proxy.h b/cc/thread_proxy.h
index e508b76461f5f8d9c6242c694d3067b1f1ea8c4c..77f9da5605493ce1a3d7c69343ceca7128062457 100644
--- a/cc/thread_proxy.h
+++ b/cc/thread_proxy.h
@@ -48,7 +48,6 @@ class ThreadProxy : public Proxy,
   virtual void SetVisible(bool visible) OVERRIDE;
   virtual bool InitializeRenderer() OVERRIDE;
   virtual bool RecreateOutputSurface() OVERRIDE;
-  virtual void CollectRenderingStats(RenderingStats* stats) OVERRIDE;
   virtual const RendererCapabilities& GetRendererCapabilities() const OVERRIDE;
   virtual void SetNeedsAnimate() OVERRIDE;
   virtual void SetNeedsCommit() OVERRIDE;
@@ -172,8 +171,6 @@ class ThreadProxy : public Proxy,
       scoped_refptr<cc::ContextProvider> offscreen_context_provider,
       bool* recreate_succeeded,
       RendererCapabilities* capabilities);
-  void RenderingStatsOnImplThread(CompletionEvent* completion,
-                                  RenderingStats* stats);
   ScheduledActionDrawAndSwapResult ScheduledActionDrawAndSwapInternal(
       bool forced_draw);
   void ForceSerializeOnSwapBuffersOnImplThread(CompletionEvent* completion);
@@ -251,9 +248,6 @@ class ThreadProxy : public Proxy,
 
   bool inside_draw_;
 
-  base::TimeDelta total_commit_time_;
-  size_t total_commit_count_;
-
   bool defer_commits_;
   scoped_ptr<BeginFrameAndCommitState> pending_deferred_commit_;