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diff --git a/chrome/browser/cocoa/disclosure_view_controller.h b/chrome/browser/cocoa/disclosure_view_controller.h
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+++ b/chrome/browser/cocoa/disclosure_view_controller.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 CHROME_BROWSER_COCOA_DISCLOSURE_VIEW_CONTROLLER_
+#define CHROME_BROWSER_COCOA_DISCLOSURE_VIEW_CONTROLLER_
+
+#import <Cocoa/Cocoa.h>
+
+@class DisclosureViewState;
+
+// A view class that provides a disclosure triangle that controls the size
+// of the view.  Toggling the disclosure triangle animates the change in
+// size of the view.  The |openHeight| is initialized from the initial size
+// of the view. |disclosureState| is initialized as |NSOnState| (of type
+// NSCellStateValue) which corresponds to "open".
+@interface DisclosureViewController : NSViewController {
+ @private
+  // The |disclosureState_| is instantiated from within |awakeFromNib|.
+  // We do not hold it as a scoped_nsobject because it is exposed as a KVO
+  // compliant property.
+  DisclosureViewState* disclosureState_;  // strong reference
+  CGFloat openHeight_;
+}
+
+@property (nonatomic, retain) DisclosureViewState* disclosureState;
+
+@end
+
+#endif // CHROME_BROWSER_COCOA_DISCLOSURE_VIEW_CONTROLLER_