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

ui/compositor/layer_animator.h

Index: ui/compositor/layer_animator.h
diff --git a/ui/compositor/layer_animator.h b/ui/compositor/layer_animator.h
index 1c92ac0f14c6c9c2938598eb2a4481146433a532..897bff9e5e1eb9a479d3c1e1ca45fae786b9a32c 100644
--- a/ui/compositor/layer_animator.h
+++ b/ui/compositor/layer_animator.h
@@ -20,6 +20,9 @@
 #include "ui/gfx/animation/tween.h"
 
 namespace cc {
+class Animation;
+class AnimationPlayer;
+class AnimationTimeline;
 class Layer;
 }
 
@@ -30,6 +33,7 @@ class Transform;
 }
 
 namespace ui {
+class Compositor;
 class Layer;
 class LayerAnimationSequence;
 class LayerAnimationDelegate;
@@ -107,6 +111,16 @@ class COMPOSITOR_EXPORT LayerAnimator
   // Unsubscribe from |cc_layer_| and subscribe to |new_layer|.
   void SwitchToLayer(scoped_refptr<cc::Layer> new_layer);
 
+  // Attach AnimationPlayer to Layer and AnimationTimeline
+  void SetCompositor(Compositor* compositor);
+  // Detach AnimationPlayer from Layer and AnimationTimeline
+  void ResetCompositor(Compositor* compositor);
+
+  // TODO(loyso): Rework it as an implementation for
+  // LayerThreadedAnimationDelegate and make it private.
+  void AddThreadedAnimation(scoped_ptr<cc::Animation> animation);
+  void RemoveThreadedAnimation(int animation_id);
+
   // Sets the animation preemption strategy. This determines the behaviour if
   // a property is set during an animation. The default is
   // IMMEDIATELY_SET_NEW_TARGET (see ImmediatelySetNewTarget below).
@@ -324,12 +338,18 @@ class COMPOSITOR_EXPORT LayerAnimator
   // LayerAnimationEventObserver
   void OnAnimationStarted(const cc::AnimationEvent& event) override;
 
+  void AttachLayerToAnimationPlayer(int layer_id);
+  void DetachLayerFromAnimationPlayer();
+
   // This is the queue of animations to run.
   AnimationQueue animation_queue_;
 
   // The target of all layer animations.
   LayerAnimationDelegate* delegate_;
 
+  // Plays CC animations.
+  scoped_refptr<cc::AnimationPlayer> animation_player_;
+
   // The currently running animations.
   RunningAnimations running_animations_;