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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_COMMON_THROB_ANIMATION_H_
+#define CHROME_COMMON_THROB_ANIMATION_H_
+
+#include "chrome/common/slide_animation.h"
+
+// A subclass of SlideAnimation that can continually slide. All of the Animation
+// methods behave like that of SlideAnimation: transition to the next state.
+// The StartThrobbing method causes the ThrobAnimation to cycle between hidden
+// and shown for a set number of cycles.
+//
+// A ThrobAnimation has two durations: the duration used when behavior like
+// a SlideAnimation, and the duration used when throbbing.
+class ThrobAnimation : public SlideAnimation {
+ public:
+  explicit ThrobAnimation(AnimationDelegate* target);
+  virtual ~ThrobAnimation() {}
+
+  // Starts throbbing. cycles_til_stop gives the number of cycles to do before
+  // stopping.
+  void StartThrobbing(int cycles_til_stop);
+
+  // Sets the duration of the slide animation when throbbing.
+  void SetThrobDuration(int duration) { throb_duration_ = duration; }
+
+  // Overridden to reset to the slide duration.
+  virtual void Reset();
+  virtual void Show();
+  virtual void Hide();
+
+  // Overriden to continually throb (assuming we're throbbing).
+  virtual void Run();
+
+  // Overridden to maintain the slide duration.
+  virtual void SetSlideDuration(int duration) { slide_duration_ = duration; }
+
+ private:
+  // Resets state such that we behave like SlideAnimation.
+  void ResetForSlide();
+
+  // Duration of the slide animation.
+  int slide_duration_;
+
+  // Duration of the slide animation when throbbing.
+  int throb_duration_;
+
+  // If throbbing, this is the number of cycles left.
+  int cycles_remaining_;
+
+  // Are we throbbing?
+  bool throbbing_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(ThrobAnimation);
+};
+
+#endif  // CHROME_COMMON_THROB_ANIMATION_H_