Implement contextmenu attribute with basic support of <menu>

Source/core/html/HTMLMenuitemElement.idl

Index: Source/core/html/HTMLMenuitemElement.idl
diff --git a/Source/core/html/HTMLMenuitemElement.idl b/Source/core/html/HTMLMenuitemElement.idl
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+++ b/Source/core/html/HTMLMenuitemElement.idl
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+/*
+ * Copyright (C) 2006 Apple Computer, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+interface HTMLMenuitemElement : HTMLElement {
+    [ Reflect ] readonly attribute DOMString type;

[esprehn, 2014/05/20 05:51:34]

Remove space around Reflect

[pals, 2014/05/21 07:55:12]

Done.

+    [ Reflect ] readonly attribute DOMString label;
+//    readonly attribute DOMString icon;
+    [ Reflect ] readonly attribute boolean disabled;
+    [ Reflect ] readonly attribute boolean checked;
+//    readonly attribute DOMString radiogroup;
+    [ Reflect ] readonly attribute boolean default;
+//    readonly attribute HTMLElement? command;
+};