Add notification mechanism when BrowserActionButton's icon has been updated.

chrome/browser/ui/views/extensions/browser_action_overflow_menu_controller.h

 // Copyright (c) 2012 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_VIEWS_EXTENSIONS_BROWSER_ACTION_OVERFLOW_MENU_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_EXTENSIONS_BROWSER_ACTION_OVERFLOW_MENU_CONTROLLER_H_
 
 #include <set>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "ui/views/controls/menu/menu_delegate.h"
 
 class Browser;
 class BrowserActionsContainer;
 class BrowserActionView;
 
+class IconUpdater;
+
 namespace views {
 class MenuRunner;
 class Widget;
 }
 
 // This class handles the overflow menu for browser actions (showing the menu,
 // drag and drop, etc). This class manages its own lifetime.
 class BrowserActionOverflowMenuController : public views::MenuDelegate {
  public:
   // The observer is notified prior to the menu being deleted.
@@ skipping 78 matching lines @@
   // won't show all items, just the one starting at |start_index| and above.
   const std::vector<BrowserActionView*>* views_;
 
   // The index into the BrowserActionView vector, indicating where to start
   // picking browser actions to draw.
   int start_index_;
 
   // Whether this controller is being used for drop.
   bool for_drop_;
 
+  // The vector keeps all icon updaters associated with menu item views in the
+  // controller. The icon updater will update the menu item view's icon when
+  // the browser action view's icon has been updated.
+  std::vector<IconUpdater*> icon_updaters_;

[sky, 2014/02/24 16:34:17]

How about a scopedvector?

+
   friend class base::DeleteHelper<BrowserActionOverflowMenuController>;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserActionOverflowMenuController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_EXTENSIONS_BROWSER_ACTION_OVERFLOW_MENU_CONTROLLER_H_