Ref count layer animation controllers.

cc/layer_animation_value_observer.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_VALUE_OBSERVER_H_
+#define CC_LAYER_ANIMATION_VALUE_OBSERVER_H_
+
+namespace cc {
+
+class CC_EXPORT LayerAnimationValueObserver {
+ public:
+  virtual ~LayerAnimationValueObserver() { }
+
+  virtual void OnOpacityAnimated(float) = 0;
+  virtual void OnTransformAnimated(const gfx::Transform&) = 0;
+};
+
+} // namespace cc
+
+#endif  // CC_LAYER_ANIMATION_VALUE_OBSERVER_H_
+