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diff --git a/chrome/browser/cocoa/animatable_view.h b/chrome/browser/cocoa/animatable_view.h
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+// Copyright (c) 2009 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 CHROME_BROWSER_COCOA_ANIMATABLE_VIEW_H_
+#define CHROME_BROWSER_COCOA_ANIMATABLE_VIEW_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/scoped_nsobject.h"
+#import "chrome/browser/cocoa/view_resizer.h"
+
+// A view that provides an animatable height property.  Provides methods to
+// animate to a new height, set a new height immediately, or cancel any running
+// animations.
+//
+// AnimatableView sends an |animationDidEnd:| message to its delegate when the
+// animation ends normally and an |animationDidStop:| message when the animation
+// was canceled (even when canceled as a result of a new animation starting).
+
+@interface AnimatableView : NSView {
+ @protected
+  IBOutlet id delegate_;  // weak, used to send animation ended messages.
+
+ @private
+  scoped_nsobject<NSAnimation> currentAnimation_;
+  id<ViewResizer> resizeDelegate_;  // weak, usually owns us
+}
+
+// Properties for bindings.
+@property(assign) id delegate;
+
+// Gets the current height of the view.  If an animation is currently running,
+// this will give the current height at the time of the call, not the target
+// height at the end of the animation.
+- (CGFloat)height;
+
+// Sets the height of the view immediately.  Cancels any running animations.
+- (void)setHeight:(CGFloat)newHeight;
+
+// Starts a new animation to the given |newHeight| for the given |duration|.
+// Cancels any running animations.
+- (void)animateToNewHeight:(CGFloat)newHeight
+                  duration:(NSTimeInterval)duration;
+
+// Cancels any running animations, leaving the view at its current
+// (mid-animation) height.
+- (void)stopAnimation;
+
+// Sets the delegate that gets notified when this view needs to chanage its
+// height.
+- (void)setResizeDelegate:(id<ViewResizer>)resizeDelegate;
+
+@end
+
+#endif  // CHROME_BROWSER_COCOA_ANIMATABLE_VIEW_H_