Ref count layer animation controllers.

cc/layer_animation_value_observer.h

Index: cc/layer_animation_value_observer.h
diff --git a/cc/layer_animation_value_observer.h b/cc/layer_animation_value_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..bb8e2ab21b0aa9e8825fae1d0c6aeb0ed5ca26aa
--- /dev/null
+++ b/cc/layer_animation_value_observer.h
@@ -0,0 +1,21 @@
+// 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_
+