Use a check item instead of changing its text.

chrome/browser/tab_contents/render_view_context_menu.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_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_H_
 #define CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 78 matching lines @@
 //
 //     // Start a task that creates the final text.
 //     my_task_ = new MyTask(this, IDC_MY_ITEM);
 //     my_task_->Start(...);
 //   }
 //
 class RenderViewContextMenuProxy {
  public:
   // Add a menu item to a context menu.
   virtual void AddMenuItem(int command_id, const string16& title) = 0;
+  virtual void AddCheckItem(int command_id, const string16& title) = 0;
   virtual void AddSeparator() = 0;
 
   // Add a submenu item to a context menu.
   virtual void AddSubMenu(int command_id,
                           const string16& label,
                           ui::MenuModel* model) = 0;
 
   // Update the status and text of the specified context-menu item.
   virtual void UpdateMenuItem(int command_id,
                               bool enabled,
@@ skipping 26 matching lines @@
   // SimpleMenuModel::Delegate implementation.
   virtual bool IsCommandIdChecked(int command_id) const OVERRIDE;
   virtual bool IsCommandIdEnabled(int command_id) const OVERRIDE;
   virtual void ExecuteCommand(int command_id) OVERRIDE;
   virtual void ExecuteCommand(int command_id, int event_flags) OVERRIDE;
   virtual void MenuWillShow(ui::SimpleMenuModel* source) OVERRIDE;
   virtual void MenuClosed(ui::SimpleMenuModel* source) OVERRIDE;
 
   // RenderViewContextMenuDelegate implementation.
   virtual void AddMenuItem(int command_id, const string16& title) OVERRIDE;
+  virtual void AddCheckItem(int command_id, const string16& title) OVERRIDE;
   virtual void AddSeparator() OVERRIDE;
   virtual void AddSubMenu(int command_id,
                           const string16& label,
                           ui::MenuModel* model) OVERRIDE;
   virtual void UpdateMenuItem(int command_id,
                               bool enabled,
                               bool hidden,
                               const string16& title) OVERRIDE;
   virtual RenderViewHost* GetRenderViewHost() const OVERRIDE;
   virtual Profile* GetProfile() const OVERRIDE;
@@ skipping 129 matching lines @@
   // An observer that disables menu items when print preview is active.
   scoped_ptr<PrintPreviewContextMenuObserver> print_preview_menu_observer_;
 
   // Our observers.
   mutable ObserverList<RenderViewContextMenuObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewContextMenu);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_RENDER_VIEW_CONTEXT_MENU_H_