Implement contextmenu attribute with basic support of <menu>

Source/core/html/HTMLMenuItemElement.cpp

Index: Source/core/html/HTMLMenuItemElement.cpp
diff --git a/Source/core/html/HTMLMenuItemElement.cpp b/Source/core/html/HTMLMenuItemElement.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5e039aa550802d5e2b5e9235993c72aa0bfc4910
--- /dev/null
+++ b/Source/core/html/HTMLMenuItemElement.cpp
@@ -0,0 +1,22 @@
+// 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.
+
+#include "config.h"
+#include "core/html/HTMLMenuItemElement.h"
+
+#include "core/HTMLNames.h"
+
+namespace blink {
+
+using namespace HTMLNames;

[tkent, 2014/07/31 06:07:55]

This is used only once.
Please remove this line, and replace menuitemTag with HTMLNames::menuitemTag.

[pals, 2014/08/01 10:03:07]

Done.

+
+inline HTMLMenuItemElement::HTMLMenuItemElement(Document& document)
+    : HTMLElement(menuitemTag, document)
+{
+    ScriptWrappable::init(this);
+}
+
+DEFINE_NODE_FACTORY(HTMLMenuItemElement)
+
+} // namespace blink