Enable accelerated animations for orphaned layers

cc/layer_animation_controller.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYER_ANIMATION_CONTROLLER_H_
 #define CC_LAYER_ANIMATION_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
@@ skipping 59 matching lines @@
 
     // This is called in response to an animation being started on the impl thread. This
     // function updates the corresponding main thread animation's start time.
     virtual void OnAnimationStarted(const AnimationEvent&) OVERRIDE;
 
     // If a sync is forced, then the next time animation updates are pushed to the impl
     // thread, all animations will be transferred.
     void setForceSync() { m_forceSync = true; }
 
     void setAnimationRegistrar(AnimationRegistrar*);
+    AnimationRegistrar* animationRegistrar() { return m_registrar; }
 
     void addObserver(LayerAnimationValueObserver*);
     void removeObserver(LayerAnimationValueObserver*);
 
+    bool hasNonOrphanedObserver();
+
 protected:
     friend class base::RefCounted<LayerAnimationController>;
 
     LayerAnimationController(int id);
     virtual ~LayerAnimationController();
 
 private:
     typedef base::hash_set<int> TargetProperties;
 
     void pushNewAnimationsToImplThread(LayerAnimationController*) const;
@@ skipping 28 matching lines @@
     bool m_isActive;
 
     ObserverList<LayerAnimationValueObserver> m_observers;
 
     DISALLOW_COPY_AND_ASSIGN(LayerAnimationController);
 };
 
 } // namespace cc
 
 #endif  // CC_LAYER_ANIMATION_CONTROLLER_H_