Implement contextmenu attribute with basic support of <menu>

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 22 matching lines @@
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
     class ContextMenu;
     class ContextMenuClient;
     class ContextMenuItem;
     class ContextMenuProvider;
     class Document;
     class Event;
+    class HTMLElement;

[tkent, 2014/08/05 02:33:23]

This is unnecessary.

+    class HTMLMenuElement;

[tkent, 2014/08/05 02:33:23]

Ditto.

     class LocalFrame;
     class Page;
 
     class ContextMenuController : public NoBaseWillBeGarbageCollectedFinalized<ContextMenuController> {
         WTF_MAKE_NONCOPYABLE(ContextMenuController); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     public:
         static PassOwnPtrWillBeRawPtr<ContextMenuController> create(Page*, ContextMenuClient*);
         ~ContextMenuController();
         void trace(Visitor*);
 
         ContextMenu* contextMenu() const { return m_contextMenu.get(); }
         void clearContextMenu();
 
         void documentDetached(Document*);
 
         void handleContextMenuEvent(Event*);
         void showContextMenu(Event*, PassRefPtr<ContextMenuProvider>);
         void showContextMenuAtPoint(LocalFrame*, float x, float y, PassRefPtr<ContextMenuProvider>);
 
         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(Event*);
         void showContextMenu(Event*);
 
         ContextMenuClient* m_client;
         OwnPtr<ContextMenu> m_contextMenu;
         RefPtr<ContextMenuProvider> m_menuProvider;
         HitTestResult m_hitTestResult;
     };
 
 }
 
 #endif