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 0811d948ae3bb8e0d666bbc41ce7d34e5fad6248..0c9472a499e0ab6c62c514cd9bb1e9303acc0e75 100644
--- a/cc/thread_proxy.h
+++ b/cc/thread_proxy.h
@@ -41,7 +41,6 @@ public:
     virtual void SetVisible(bool) OVERRIDE;
     virtual bool InitializeRenderer() OVERRIDE;
     virtual bool RecreateOutputSurface() OVERRIDE;
-    virtual void GetRenderingStats(RenderingStats* stats) OVERRIDE;
     virtual const RendererCapabilities& GetRendererCapabilities() const OVERRIDE;
     virtual void SetNeedsAnimate() OVERRIDE;
     virtual void SetNeedsCommit() OVERRIDE;
@@ -139,7 +138,6 @@ private:
     void setFullRootLayerDamageOnImplThread();
     void acquireLayerTexturesForMainThreadOnImplThread(CompletionEvent*);
     void recreateOutputSurfaceOnImplThread(CompletionEvent*, scoped_ptr<OutputSurface>, scoped_refptr<cc::ContextProvider> offscreenContextProvider, bool* recreateSucceeded, RendererCapabilities*);
-    void renderingStatsOnImplThread(CompletionEvent*, RenderingStats*);
     ScheduledActionDrawAndSwapResult scheduledActionDrawAndSwapInternal(bool forcedDraw);
     void forceSerializeOnSwapBuffersOnImplThread(CompletionEvent*);
     void setNeedsForcedCommitOnImplThread();
@@ -205,9 +203,6 @@ private:
 
     bool m_insideDraw;
 
-    base::TimeDelta m_totalCommitTime;
-    size_t m_totalCommitCount;
-
     bool m_deferCommits;
     scoped_ptr<BeginFrameAndCommitState> m_pendingDeferredCommit;