cc: Check for completed raster tasks at interval.

cc/layer_tree_host_impl.h

Index: cc/layer_tree_host_impl.h
diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index b95607494b9663b0a36a058f7081fa06f4bf20ac..c5e23c8348f582406f3e7f08563fb27d2ebae403 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -51,8 +51,10 @@ public:
     virtual void onHasPendingTreeStateChanged(bool hasPendingTree) = 0;
     virtual void setNeedsRedrawOnImplThread() = 0;
     virtual void didUploadVisibleHighResolutionTileOnImplThread() = 0;
+    virtual void didDetectIdleRasterOnImplThread() = 0;
     virtual void setNeedsCommitOnImplThread() = 0;
     virtual void setNeedsManageTilesOnImplThread() = 0;
+    virtual void setNeedsCheckForCompletedRasterTasksOnImplThread() = 0;
     virtual void postAnimationEventsToMainThreadOnImplThread(scoped_ptr<AnimationEventsVector>, base::Time wallClockTime) = 0;
     // Returns true if resources were deleted by this call.
     virtual bool reduceContentsTextureMemoryOnImplThread(size_t limitBytes, int priorityCutoff) = 0;
@@ -137,7 +139,9 @@ public:
 
     // TileManagerClient implementation.
     virtual void ScheduleManageTiles() OVERRIDE;
+    virtual void ScheduleCheckForCompletedRasterTasks() OVERRIDE;
     virtual void DidUploadVisibleHighResolutionTile() OVERRIDE;
+    virtual void DidDetectIdleRaster() OVERRIDE;
 
     // OutputSurfaceClient implementation.
     virtual void OnVSyncParametersChanged(base::TimeTicks timebase, base::TimeDelta interval) OVERRIDE;
@@ -263,6 +267,8 @@ public:
     scoped_ptr<base::Value> activationStateAsValue() const;
     scoped_ptr<base::Value> frameStateAsValue() const;
 
+    void checkForCompletedRasterTasks();
+
 protected:
     LayerTreeHostImpl(const LayerTreeSettings&, LayerTreeHostImplClient*, Proxy*);
     void activatePendingTree();