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diff --git a/app/animation_delegate.h b/app/animation_delegate.h
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+++ b/app/animation_delegate.h
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+// Copyright (c) 2010 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 APP_ANIMATION_DELEGATE_H_
+#define APP_ANIMATION_DELEGATE_H_
+#pragma once
+
+class Animation;
+
+// AnimationDelegate
+//
+//  Implement this interface when you want to receive notifications about the
+//  state of an animation.
+class AnimationDelegate {
+ public:
+  // Called when an animation has completed.
+  virtual void AnimationEnded(const Animation* animation) {}
+
+  // Called when an animation has progressed.
+  virtual void AnimationProgressed(const Animation* animation) {}
+
+  // Called when an animation has been canceled.
+  virtual void AnimationCanceled(const Animation* animation) {}
+
+ protected:
+  virtual ~AnimationDelegate() {}
+};
+
+#endif  // APP_ANIMATION_DELEGATE_H_