Implement contextmenu attribute with basic support of <menu>

Source/core/page/CustomContextMenuProvider.h

Index: Source/core/page/CustomContextMenuProvider.h
diff --git a/Source/core/page/CustomContextMenuProvider.h b/Source/core/page/CustomContextMenuProvider.h
new file mode 100644
index 0000000000000000000000000000000000000000..c0a6277b93c123972b1933a482a7ef64067667f3
--- /dev/null
+++ b/Source/core/page/CustomContextMenuProvider.h
@@ -0,0 +1,38 @@
+// 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 CustomContextMenuProvider_h
+#define CustomContextMenuProvider_h
+
+#include "core/page/ContextMenuProvider.h"
+#include "platform/ContextMenuItem.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class ContextMenu;
+class Document;
+
+class CustomContextMenuProvider FINAL : public ContextMenuProvider {
+public:
+    static PassRefPtr<CustomContextMenuProvider> create(PassRefPtr<Document> document, const Vector<ContextMenuItem>& items)

[tkent, 2014/07/31 06:07:56]

PassRefPtr<Document> -> Document&

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

Done.

+    {
+        return adoptRef(new CustomContextMenuProvider(document, items));
+    }
+
+private:
+    CustomContextMenuProvider(PassRefPtr<Document>, const Vector<ContextMenuItem>& items);

[tkent, 2014/07/31 06:07:56]

Ditto.

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

Done.

+    virtual ~CustomContextMenuProvider();
+
+    virtual void populateContextMenu(ContextMenu*) OVERRIDE;
+    virtual void contextMenuItemSelected(const ContextMenuItem*) OVERRIDE;
+    virtual void contextMenuCleared() OVERRIDE { }
+
+    RefPtrWillBePersistent<Document> m_document;
+    Vector<ContextMenuItem> m_items;
+};
+
+} // namespace blink
+
+#endif