[Mac] Replace the custom bookmark menus with native NSMenus.

chrome/browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller.h

 // 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.
 
 // Controller (MVC) for the bookmark menu.
 // All bookmark menu item commands get directed here.
 // Unfortunately there is already a C++ class named BookmarkMenuController.
 
 #ifndef CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_MENU_COCOA_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_MENU_COCOA_CONTROLLER_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/cocoa_protocols.h"
 #include "webkit/glue/window_open_disposition.h"
 
 class BookmarkNode;
 class BookmarkMenuBridge;
+@protocol BookmarkMenuDelegate;
 
 @interface BookmarkMenuCocoaController : NSObject<NSMenuDelegate> {
  @private
   BookmarkMenuBridge* bridge_;  // weak; owns me
-  NSMenu *menu_;
+  NSMenu* menu_;
+  id<BookmarkMenuDelegate> delegate_;
 }
 
-// The Bookmarks menu
 @property(nonatomic, readonly) NSMenu* menu;
+@property(nonatomic, assign) id<BookmarkMenuDelegate> delegate;
 
 // Return an autoreleased string to be used as a menu title for the
 // given bookmark node.
 + (NSString*)menuTitleForNode:(const BookmarkNode*)node;
 
 // Make a relevant tooltip string for node.
 + (NSString*)tooltipForNode:(const BookmarkNode*)node;
 
 - (id)initWithBridge:(BookmarkMenuBridge *)bridge
              andMenu:(NSMenu*)menu;
 
 // Called by any Bookmark menu item.
 // The menu item's tag is the bookmark ID.
 - (IBAction)openBookmarkMenuItem:(id)sender;
 - (IBAction)openAllBookmarks:(id)sender;
 - (IBAction)openAllBookmarksNewWindow:(id)sender;
 - (IBAction)openAllBookmarksIncognitoWindow:(id)sender;
 
 @end  // BookmarkMenuCocoaController
 
+////////////////////////////////////////////////////////////////////////////////
+
+// This protocol is used to forward relevant methods from NSMenuDelegate to
+// some other object.
+@protocol BookmarkMenuDelegate <NSObject>
+@optional
+
+- (void)bookmarkMenuWillOpen:(BookmarkMenuCocoaController*)controller;
+- (void)bookmarkMenuDidClose:(BookmarkMenuCocoaController*)controller;
+
+@end
+
+////////////////////////////////////////////////////////////////////////////////
 
 @interface BookmarkMenuCocoaController (ExposedForUnitTests)
 - (const BookmarkNode*)nodeForIdentifier:(int)identifier;
 - (void)openURLForNode:(const BookmarkNode*)node;
 - (void)openAll:(NSInteger)tag
     withDisposition:(WindowOpenDisposition)disposition;
 @end  // BookmarkMenuCocoaController (ExposedForUnitTests)
 
 #endif  // CHROME_BROWSER_UI_COCOA_BOOKMARKS_BOOKMARK_MENU_COCOA_CONTROLLER_H_