NOT READY FOR REVIEW - switch to a subscriber model for rendering stats

cc/thread_proxy.h

Index: cc/thread_proxy.h
diff --git a/cc/thread_proxy.h b/cc/thread_proxy.h
index 721bb6884c530fe0c9139582267eed1adf233cb2..372a31e56af4af6c61b318a58ebaae4839487e35 100644
--- a/cc/thread_proxy.h
+++ b/cc/thread_proxy.h
@@ -17,6 +17,7 @@ namespace cc {
 
 class InputHandler;
 class LayerTreeHost;
+class RenderingStatsSubscriber;
 class ResourceUpdateQueue;
 class Scheduler;
 class ScopedThreadProxy;
@@ -39,6 +40,8 @@ public:
     virtual bool initializeRenderer() OVERRIDE;
     virtual bool recreateContext() OVERRIDE;
     virtual void renderingStats(RenderingStats*) OVERRIDE;
+    virtual void startRecordingRenderingStats() OVERRIDE;
+    virtual void stopRecordingRenderingStats(RenderingStats*) OVERRIDE;
     virtual const RendererCapabilities& rendererCapabilities() const OVERRIDE;
     virtual void loseContext() OVERRIDE;
     virtual void setNeedsAnimate() OVERRIDE;
@@ -120,6 +123,8 @@ private:
     void initializeRendererOnImplThread(CompletionEvent*, bool* initializeSucceeded, RendererCapabilities*);
     void layerTreeHostClosedOnImplThread(CompletionEvent*);
     void setFullRootLayerDamageOnImplThread();
+    void startRecordingRenderingStatsOnImplThread(CompletionEvent*);
+    void stopRecordingRenderingStatsOnImplThread(CompletionEvent*, RenderingStats*);
     void acquireLayerTexturesForMainThreadOnImplThread(CompletionEvent*);
     void recreateContextOnImplThread(CompletionEvent*, GraphicsContext*, bool* recreateSucceeded, RendererCapabilities*);
     void renderingStatsOnImplThread(CompletionEvent*, RenderingStats*);
@@ -171,8 +176,10 @@ private:
 
     bool m_renderVSyncEnabled;
 
+    // TODO(vollick): These should go away once we switch to the subscriber model.
     base::TimeDelta m_totalCommitTime;
     size_t m_totalCommitCount;
+    scoped_ptr<RenderingStatsSubscriber> m_renderingStatsSubscriber;
 
     bool m_deferCommits;
     bool m_deferredCommitPending;