Implement contextmenu attribute with basic support of <menu>

Source/core/html/HTMLMenuElement.h

Index: Source/core/html/HTMLMenuElement.h
diff --git a/Source/core/html/HTMLMenuElement.h b/Source/core/html/HTMLMenuElement.h
index ed04da6b92bba914ef7dc025eb5099fb140ab24a..997bc71a648d64ccbb10ad992eb3003b66fe17b0 100644
--- a/Source/core/html/HTMLMenuElement.h
+++ b/Source/core/html/HTMLMenuElement.h
@@ -23,18 +23,36 @@
 #ifndef HTMLMenuElement_h
 #define HTMLMenuElement_h
 
+#include "core/html/CustomContextMenuProvider.h"
 #include "core/html/HTMLElement.h"
+#include "core/page/ContextMenuProvider.h"
+#include "platform/ContextMenu.h"
+#include "platform/ContextMenuItem.h"
 
 namespace blink {
 
+class HTMLMenuElement;

[tkent, 2014/07/25 04:42:38]

This is unnecessary.

[pals, 2014/07/30 09:47:44]

Done.

+
 class HTMLMenuElement FINAL : public HTMLElement {
 public:
     DECLARE_NODE_FACTORY(HTMLMenuElement);
 
+    virtual void defaultEventHandler(Event*) OVERRIDE;
+
+    CustomContextMenuProvider* menuProvider() { return m_menuProvider.get(); }
+    CustomContextMenuProvider& ensureMenuProvider();
+    void populateContextMenuItems(const HTMLMenuElement&, ContextMenu&);
+    HTMLMenuItemElement* menuItemAt(unsigned menuId);
+    HTMLElement* subjectElement() { return m_subject.get(); }
+
 private:
     explicit HTMLMenuElement(Document&);
+
+    RefPtrWillBeMember<CustomContextMenuProvider> m_menuProvider;

[tkent, 2014/07/25 04:42:38]

HTMLMenuElement should not keep CustomContextMenuProvider.  See the comment on
ContextMenuController.cpp.

[pals, 2014/07/30 09:47:44]

Done.

+    RefPtrWillBeMember<HTMLElement> m_subject;

[tkent, 2014/07/25 04:42:38]

This member is not referred.

[pals, 2014/07/30 09:47:44]

This is referred in ContextMenuController.cpp.

+    Vector<HTMLMenuItemElement*> m_menuItems;

[tkent, 2014/07/25 04:42:38]

should be WillBeHeapVector<RawPtrWillBeMember<HTMLMenuItemElement> >, and we
need trace() override.

[pals, 2014/07/30 09:47:44]

Moved this code to ContextMenuController.cpp.

 };
 
-} //namespace
+} // namespace blink
 
 #endif