Implement contextmenu attribute with basic support of <menu>

Source/core/html/HTMLMenuElementEventListener.h

+// Copyright 2014 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 HTMLMenuElementEventListener_h
+#define HTMLMenuElementEventListener_h
+
+#include "core/events/EventListener.h"
+#include "core/html/HTMLMenuElement.h"
+
+namespace WebCore {
+
+class RelatedEvent;
+
+class HTMLMenuElementEventListener FINAL : public EventListener {

[esprehn, 2014/06/06 22:30:42]

Lets not do this. I see IndexedDB does it, but we really shouldn't be doing
this.

[pals, 2014/06/10 10:42:39]

Done. Removed.

+public:
+    static PassRefPtr<HTMLMenuElementEventListener> create(HTMLMenuElement* menu) { return adoptRef(new HTMLMenuElementEventListener(menu)); }
+
+    virtual bool operator==(const EventListener& other);
+
+private:
+    explicit HTMLMenuElementEventListener(HTMLMenuElement* menu)
+        : EventListener(NativeEventListenerType)
+        , m_menu(menu)
+    {
+    }
+
+    virtual void handleEvent(ExecutionContext*, Event*);
+
+    RefPtr<HTMLMenuElement> m_menu;
+};
+
+const HTMLMenuElementEventListener* toHTMLMenuElementEventListener(const EventListener*);
+
+}
+
+#endif