CC Animations: Port UI Browser Compositor to use compositor animation timelines.

ui/compositor/layer.h

Index: ui/compositor/layer.h
diff --git a/ui/compositor/layer.h b/ui/compositor/layer.h
index 5d997ae1e54623d9307dfc75617406dcd2e84027..64fc681e28e876e5dfbea6c23d81579c8dce7321 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -34,6 +34,7 @@
 class SkCanvas;
 
 namespace cc {
+class AnimationPlayer;
 class ContentLayer;
 class CopyOutputRequest;
 class DelegatedFrameProvider;
@@ -420,6 +421,13 @@ class COMPOSITOR_EXPORT Layer
   // Creates a corresponding composited layer for |type_|.
   void CreateCcLayer();
 
+  // Attach/Detach CC Layer animation event observers and AnimationPlayer.
+  void AttachPlayerLayer();
+  void DetachPlayerLayer();
+
+  void AttachAnimationPlayers(cc::AnimationTimeline* timeline);
+  void DetachAnimationPlayers(cc::AnimationTimeline* timeline);
+
   // Recomputes and sets to |cc_layer_|.
   void RecomputeDrawsContentAndUVRect();
   void RecomputePosition();
@@ -502,6 +510,7 @@ class COMPOSITOR_EXPORT Layer
   LayerOwner* owner_;
 
   scoped_refptr<LayerAnimator> animator_;
+  scoped_refptr<cc::AnimationPlayer> animation_player_;
 
   // Animations that are passed to AddThreadedAnimation before this layer is
   // added to a tree.