CC Animations: Make ui::LayerAnimator a LayerAnimationEventObserver (instead of ui::Layer)

ui/compositor/test/test_layer_animation_delegate.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_TEST_TEST_LAYER_ANIMATION_DELEGATE_H_
 #define UI_COMPOSITOR_TEST_TEST_LAYER_ANIMATION_DELEGATE_H_
 
 #include "base/compiler_specific.h"
+#include "cc/layers/layer.h"
 #include "ui/compositor/layer_animation_delegate.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/transform.h"
 
 namespace ui {
 
 class TestLayerAnimationDelegate : public LayerAnimationDelegate {
  public:
   TestLayerAnimationDelegate();
   explicit TestLayerAnimationDelegate(const LayerAnimationDelegate& other);
@@ skipping 12 matching lines @@
   gfx::Transform GetTransformForAnimation() const override;
   float GetOpacityForAnimation() const override;
   bool GetVisibilityForAnimation() const override;
   float GetBrightnessForAnimation() const override;
   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;
+  cc::Layer* GetCcLayer() const override;
 
  private:
+  void CreateCcLayer();
+
   gfx::Rect bounds_;
   gfx::Transform transform_;
   float opacity_;
   bool visibility_;
   float brightness_;
   float grayscale_;
   SkColor color_;
+  scoped_refptr<cc::Layer> cc_layer_;
 
   // Allow copy and assign.
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_TEST_TEST_LAYER_ANIMATION_DELEGATE_H_