Add Hide to app menu.

chrome/browser/ui/cocoa/apps/app_shim_menu_controller_mac.h

 // Copyright 2013 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_APPS_APP_SHIM_MENU_CONTROLLER_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_APPS_APP_SHIM_MENU_CONTROLLER_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 
+// Used by AppShimMenuController to manage menu items that are a copy of a
+// Chrome menu item but with a different action. This manages unsetting and
+// restoring the original item's key equivalent, so that we can use the same
+// key equivalent in the copied item with a different action.
+@interface DoppelgangerMenuItem : NSObject {

[tapted, 2013/09/03 08:17:25]

I think you can forward declare this, using 
@class DoppelgangerMenuItem

[jackhou1, 2013/09/04 01:31:31]

Done.

+ @private
+  base::scoped_nsobject<NSMenuItem> menuItem_;
+  base::scoped_nsobject<NSMenuItem> sourceItem_;
+  int resourceId_;
+}
+
+@end
+
 // This controller listens to NSWindowDidBecomeMainNotification and
 // NSWindowDidResignMainNotification and modifies the main menu bar to mimic a
 // main menu for the app. When an app window becomes main, all Chrome menu items
 // are hidden and menu items for the app are appended to the main menu. When the
 // app window resigns main, its menu items are removed and all Chrome menu items
 // are unhidden.
 @interface AppShimMenuController : NSObject {
  @private
   // The extension id of the currently focused packaged app.
   base::scoped_nsobject<NSString> appId_;
-  // A reference to the "Quit Chrome" menu item.
-  base::scoped_nsobject<NSMenuItem> chromeMenuQuitItem_;
+  // Items that need a doppelganger.
+  base::scoped_nsobject<DoppelgangerMenuItem> hideDoppelganger_;
+  base::scoped_nsobject<DoppelgangerMenuItem> quitDoppelganger_;
   // Menu items for the currently focused packaged app.
   base::scoped_nsobject<NSMenuItem> appMenuItem_;
   base::scoped_nsobject<NSMenuItem> fileMenuItem_;
   base::scoped_nsobject<NSMenuItem> editMenuItem_;
   base::scoped_nsobject<NSMenuItem> windowMenuItem_;
 }
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_APPS_APP_SHIM_MENU_CONTROLLER_MAC_H_