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diff --git a/chrome/browser/ui/cocoa/toolbar/toolbar_button.h b/chrome/browser/ui/cocoa/toolbar/toolbar_button.h
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+++ b/chrome/browser/ui/cocoa/toolbar/toolbar_button.h
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+// Copyright (c) 2011 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_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_H_
+#define CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_H_
+#pragma once
+
+#import <Cocoa/Cocoa.h>
+
+// NSButton subclass which handles middle mouse clicking.
+
+@interface ToolbarButton : NSButton {
+ @protected
+  // YES when middle mouse clicks should be handled.
+  BOOL handleMiddleClick_;
+
+  // YES when a middle mouse click is being handled. This is set to YES by an
+  // NSOtherMouseDown event, and NO by an NSOtherMouseUp event. While this is
+  // YES, other mouse button events should be ignored.
+  BOOL handlingMiddleClick_;
+}
+
+// Whether or not to handle the mouse middle click events.
+@property(assign, nonatomic) BOOL handleMiddleClick;
+
+@end
+
+@interface ToolbarButton (ExposedForTesting)
+- (BOOL)shouldHandleEvent:(NSEvent*)theEvent;
+@end
+
+#endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_H_