CC Animations: Make LayerAnimationController creation optional

ui/compositor/layer.h

 // Copyright (c) 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 UI_COMPOSITOR_LAYER_H_
 #define UI_COMPOSITOR_LAYER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 395 matching lines @@
   float GetGrayscaleForAnimation() const override;
   SkColor GetColorForAnimation() const override;
   float GetDeviceScaleFactor() const override;
   void AddThreadedAnimation(scoped_ptr<cc::Animation> animation) override;
   void RemoveThreadedAnimation(int animation_id) override;
   LayerAnimatorCollection* GetLayerAnimatorCollection() override;
 
   // Creates a corresponding composited layer for |type_|.
   void CreateCcLayer();
 
+  void RegisterForAnimations(Compositor* compositor);
+  void AttachObservers();
+  void DetachObservers();
+
   // Recomputes and sets to |cc_layer_|.
   void RecomputeDrawsContentAndUVRect();
   void RecomputePosition();
 
   // Set all filters which got applied to the layer.
   void SetLayerFilters();
 
   // Set all filters which got applied to the layer background.
   void SetLayerBackgroundFilters();
 
@@ skipping 102 matching lines @@
   // The size of the frame or texture in DIP, set when SetShowDelegatedContent
   // or SetTextureMailbox was called.
   gfx::Size frame_size_in_dip_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_H_