[Mac] Don't close the Wrench menu after using the zoom buttons if the menu was opened sticky.

chrome/browser/cocoa/menu_tracked_button.h

 // 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_MENU_TRACKED_BUTTON_H_
 #define CHROME_BROWSER_COCOA_MENU_TRACKED_BUTTON_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 // A MenuTrackedButton is meant to be used whenever a button is placed inside
 // the custom view of an NSMenuItem. If the user opens the menu in a non-sticky
 // fashion (i.e. clicks, holds, and drags) and then releases the mouse over
 // a MenuTrackedButton, it will |-performClick:| itself.
 @interface MenuTrackedButton : NSButton {
  @private
   // If the button received a |-mouseEntered:| event. This short-circuits the
   // custom drag tracking logic.
   BOOL didEnter_;
 
   // Whether or not the user is in a click-drag-release event sequence. If so
   // and this receives a |-mouseUp:|, then this will click itself.
   BOOL tracking_;
 }
 
+@property (nonatomic, readonly, getter=isTracking) BOOL tracking;
+
 @end
 
 #endif  // CHROME_BROWSER_COCOA_MENU_TRACKED_BUTTON_H_