cc: Make animations tick regardless of drawing.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 520fc90c7684be09698cd76bfd858808fc666fd6..eb78e4eca46d269532b8dc9baa0345d86531b977 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -140,6 +140,8 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
   virtual void CommitComplete();
   virtual void Animate(base::TimeTicks monotonic_time,
                        base::Time wall_clock_time);
+  virtual void UpdateAnimationState();
+  void UpdateBackgroundAnimateTicking();
 
   void ManageTiles();
   void SetAnticipatedDrawTime(base::TimeTicks time);
@@ -355,7 +357,6 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
   // Virtual for testing.
   virtual void AnimateLayers(base::TimeTicks monotonic_time,
                              base::Time wall_clock_time);
-  virtual void UpdateAnimationState();
 
   // Virtual for testing.
   virtual base::TimeDelta LowFrequencyAnimationInterval() const;
@@ -388,7 +389,6 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
   // only be called from PrepareToDraw, as DidDrawAllLayers must be called
   // if this helper function is called.
   bool CalculateRenderPasses(FrameData* frame);
-  void SetBackgroundTickingEnabled(bool enabled);
 
   void SendDidLoseOutputSurfaceRecursive(LayerImpl* current);
   void ClearRenderSurfaces();