Implement DOMPoint of geometry interfaces.

Source/core/dom/DOMPointReadOnly.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 DOMPointReadOnly_h
+#define DOMPointReadOnly_h
+
+#include "platform/heap/Handle.h"
+
+namespace WebCore {
+
+class DOMPointReadOnly : public GarbageCollected<DOMPointReadOnly> {
+public:
+    static DOMPointReadOnly* create(double x, double y, double z, double w);
+
+    double x() const { return m_x; }
+    double y() const { return m_y; }
+    double z() const { return m_z; }
+    double w() const { return m_w; }
+
+    void trace(Visitor*) { }
+
+protected:
+    DOMPointReadOnly(double x, double y, double z, double w);
+
+    double m_x;
+    double m_y;
+    double m_z;
+    double m_w;
+};
+
+} // namespace WebCore
+
+#endif