compositor: Tick the UI animations from cc, instead of from timer callbacks.

ui/compositor/layer.h

Index: ui/compositor/layer.h
diff --git a/ui/compositor/layer.h b/ui/compositor/layer.h
index 2b0d9138361dd46eabb0dbe199716c63c2256f3e..069f1671cf4f2b5ffcfbc251fc646d3b007154e3 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -287,6 +287,8 @@ class COMPOSITOR_EXPORT Layer
 
   const SkRegion& damaged_region() const { return damaged_region_; }
 
+  void CompleteAllAnimations();
+
   // Suppresses painting the content by disconnecting |delegate_|.
   void SuppressPaint();
 
@@ -338,6 +340,8 @@ class COMPOSITOR_EXPORT Layer
  private:
   friend class LayerOwner;
 
+  void CollectAnimators(std::vector<scoped_refptr<LayerAnimator> >* animators);
+
   // Stacks |child| above or below |other|.  Helper method for StackAbove() and
   // StackBelow().
   void StackRelativeTo(Layer* child, Layer* other, bool above);
@@ -366,6 +370,7 @@ class COMPOSITOR_EXPORT Layer
   virtual void AddThreadedAnimation(
       scoped_ptr<cc::Animation> animation) OVERRIDE;
   virtual void RemoveThreadedAnimation(int animation_id) OVERRIDE;
+  virtual LayerAnimatorCollection* GetLayerAnimatorCollection() OVERRIDE;
 
   // Creates a corresponding composited layer for |type_|.
   void CreateWebLayer();
@@ -389,6 +394,12 @@ class COMPOSITOR_EXPORT Layer
   // be called once we have been added to a tree.
   void SendPendingThreadedAnimations();
 
+  void AddAnimatorsInTreeToCollection(LayerAnimatorCollection* collection);
+  void RemoveAnimatorsInTreeFromCollection(LayerAnimatorCollection* collection);
+
+  // Returns whether the layer has an animating LayerAnimator.
+  bool IsAnimating() const;
+
   const LayerType type_;
 
   Compositor* compositor_;