Add support to populate custom context menu items.

Source/core/page/ContextMenuController.h

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 50 matching lines @@
 
         void contextMenuItemSelected(const ContextMenuItem*);
 
         const HitTestResult& hitTestResult() { return m_hitTestResult; }
 
     private:
         ContextMenuController(Page*, ContextMenuClient*);
 
         PassOwnPtr<ContextMenu> createContextMenu(Event*);
         PassOwnPtr<ContextMenu> createContextMenu(LocalFrame*, const LayoutPoint&);
+        void populateCustomContextMenu(const Event&);
         void showContextMenu(Event*);
 
         ContextMenuClient* m_client;
         OwnPtr<ContextMenu> m_contextMenu;
         RefPtr<ContextMenuProvider> m_menuProvider;
         HitTestResult m_hitTestResult;
     };
 
 }
 
 #endif