AnimatableView needs to be an NSAnimationDelegate

chrome/browser/cocoa/animatable_view.h

 // 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>
 
+#import "base/cocoa_protocols_mac.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 {
+@interface AnimatableView : NSView<NSAnimationDelegate> {
  @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;
@@ skipping 15 matching lines @@
 // (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_