cc: Check for completed raster tasks at interval.

cc/thread_proxy.h

Index: cc/thread_proxy.h
diff --git a/cc/thread_proxy.h b/cc/thread_proxy.h
index 9e383bbc7b0ab6caedc5a5d39272385023498528..126fadaa64a9240416126588835ece8843efb5fe 100644
--- a/cc/thread_proxy.h
+++ b/cc/thread_proxy.h
@@ -65,8 +65,10 @@ public:
     virtual void onHasPendingTreeStateChanged(bool hasPendingTree) OVERRIDE;
     virtual void setNeedsRedrawOnImplThread() OVERRIDE;
     virtual void didUploadVisibleHighResolutionTileOnImplThread() OVERRIDE;
+    virtual void didDetectIdleRasterOnImplThread() OVERRIDE;
     virtual void setNeedsCommitOnImplThread() OVERRIDE;
     virtual void setNeedsManageTilesOnImplThread() OVERRIDE;
+    virtual void setNeedsCheckForCompletedRasterTasksOnImplThread() OVERRIDE;
     virtual void postAnimationEventsToMainThreadOnImplThread(scoped_ptr<AnimationEventsVector>, base::Time wallClockTime) OVERRIDE;
     virtual bool reduceContentsTextureMemoryOnImplThread(size_t limitBytes, int priorityCutoff) OVERRIDE;
     virtual void reduceWastedContentsTextureMemoryOnImplThread() OVERRIDE;
@@ -135,6 +137,7 @@ private:
     void initializeRendererOnImplThread(CompletionEvent*, bool* initializeSucceeded, RendererCapabilities*);
     void layerTreeHostClosedOnImplThread(CompletionEvent*);
     void manageTilesOnImplThread();
+    void checkForCompletedRasterTasksOnImplThread();
     void setFullRootLayerDamageOnImplThread();
     void acquireLayerTexturesForMainThreadOnImplThread(CompletionEvent*);
     void recreateOutputSurfaceOnImplThread(CompletionEvent*, scoped_ptr<OutputSurface>, bool* recreateSucceeded, RendererCapabilities*);
@@ -161,6 +164,7 @@ private:
     bool m_texturesAcquired;
     bool m_inCompositeAndReadback;
     bool m_manageTilesPending;
+    bool m_checkForCompletedRasterTasksPending;
     // Weak pointer to use when posting tasks to the impl thread.
     base::WeakPtr<ThreadProxy> m_implThreadWeakPtr;
 
@@ -169,6 +173,9 @@ private:
     base::WeakPtr<ThreadProxy> m_mainThreadWeakPtr;
     base::WeakPtrFactory<ThreadProxy> m_weakFactory;
 
+    base::WeakPtrFactory<ThreadProxy>
+        m_weakCheckForCompletedRasterTasksFactory;
+
     scoped_ptr<LayerTreeHostImpl> m_layerTreeHostImpl;
 
     scoped_ptr<InputHandler> m_inputHandlerOnImplThread;