Check if the delegate changed the visibility of child MenuItemViews.

ui/views/controls/menu/menu_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 UI_VIEWS_CONTROLS_MENU_MENU_DELEGATE_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_DELEGATE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 103 matching lines @@
   // screen coordinates.
   // Returns true if a context menu was displayed, otherwise false
   virtual bool ShowContextMenu(MenuItemView* source,
                                int id,
                                const gfx::Point& p,
                                ui::MenuSourceType source_type);
 
   // Controller
   virtual bool SupportsCommand(int id) const;
   virtual bool IsCommandEnabled(int id) const;
+  virtual bool IsCommandVisible(int id) const;
   virtual bool GetContextualLabel(int id, base::string16* out) const;
   virtual void ExecuteCommand(int id) {
   }
 
   // If nested menus are showing (nested menus occur when a menu shows a context
   // menu) this is invoked to determine if all the menus should be closed when
   // the user selects the menu with the command |id|. This returns true to
   // indicate that all menus should be closed. Return false if only the
   // context menu should be closed.
   virtual bool ShouldCloseAllMenusOnExecute(int id);
@@ skipping 112 matching lines @@
                                         int* left_margin,
                                         int* right_margin) const;
   // Returns true if the labels should reserve additional spacing for e.g.
   // submenu indicators at the end of the line.
   virtual bool ShouldReserveSpaceForSubmenuIndicator() const;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_DELEGATE_H_