backup for dynamic recent tabs submenu

chrome/browser/ui/views/menu_items_changed_delegate.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_MENU_ITEMS_CHANGED_DELEGATE_H_
+#define CHROME_BROWSER_UI_VIEWS_MENU_ITEMS_CHANGED_DELEGATE_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+
+namespace ui {
+class MenuModel;
+};
+
+namespace views {
+class MenuItemView;
+};
+
+// Interface for ui::MenuModelDelegate to communicate with views::MenuDelegate
+// when menu items changed.
+class MenuItemsChangedDelegate {
+ public:
+  virtual void OnItemAdded(views::MenuItemView* parent, int menu_index,
+                           ui::MenuModel* model, int model_index,
+                           int item_id) = 0;
+  virtual void OnItemRemoved(views::MenuItemView* parent, int menu_index,
+                             int item_id) = 0;
+
+  virtual void UpdateMapOfMenuItemIdAndModel(
+      ui::MenuModel* model,
+      std::vector<int>& item_ids) = 0;
+
+ protected:
+  virtual ~MenuItemsChangedDelegate() {}
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_MENU_ITEMS_CHANGED_DELEGATE_H_