Geometry: Reimplement DOMPoint using V8 extras.

third_party/WebKit/Source/core/dom/DOMPointReadOnly.idl

-// 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.
-
-// http://dev.w3.org/fxtf/geometry/#DOMPoint
-
-[
-    Constructor(unrestricted double x, unrestricted double y,
-                unrestricted double z, unrestricted double w),
-    // FIXME: Exposed=(Window,Worker)
-    GarbageCollected,
-    RuntimeEnabled=GeometryInterfaces,
-] interface DOMPointReadOnly {
-    readonly attribute unrestricted double x;
-    readonly attribute unrestricted double y;
-    readonly attribute unrestricted double z;
-    readonly attribute unrestricted double w;
-
-    // FIXME: Implement matrixTransform.
-    // DOMPoint matrixTransform(DOMMatrixReadOnly matrix);
-};