cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index d11b0a7de35c5cac55e4ab22f2ec960d5c4ca861..5a235e320902505899d2551dc71fb93d598f7dae 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/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;
@@ -174,8 +173,6 @@ 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);
@@ -254,9 +251,6 @@ 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_;