[WIP] Implement DOMPoint of geometry interface.

Source/core/dom/DOMPoint.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 DOMPoint_h
+#define DOMPoint_h
+
+#include "core/dom/DOMPointReadOnly.h"
+
+#include "platform/heap/Handle.h"
+#include "wtf/RefCounted.h"
+
+namespace WebCore {
+
+class DOMPoint : public DOMPointReadOnly {
+public:
+    static DOMPoint* create()
+    {
+        return new DOMPoint();
+    }
+
+    virtual void trace(Visitor* v) OVERRIDE { DOMPointReadOnly::trace(v); }
+
+protected:
+    DOMPoint() { }
+};
+
+} // namespace WebCore
+
+#endif