Implement DOMRect of geometry interfaces.

Source/core/dom/DOMRect.idl

Index: Source/core/dom/DOMRect.idl
diff --git a/Source/core/dom/DOMRect.idl b/Source/core/dom/DOMRect.idl
new file mode 100644
index 0000000000000000000000000000000000000000..8a0577841333f05cf296f21482a1ef7397b22f5b
--- /dev/null
+++ b/Source/core/dom/DOMRect.idl
@@ -0,0 +1,16 @@
+// 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.
+
+[
+    Constructor(optional unrestricted double x = 0,
+                optional unrestricted double y = 0,
+                optional unrestricted double width = 0,
+                optional unrestricted double height = 0),
+    RuntimeEnabled=GeometryInterfaces,
+] interface DOMRect : DOMRectReadOnly {
+    attribute unrestricted double x;
+    attribute unrestricted double y;
+    attribute unrestricted double width;
+    attribute unrestricted double height;
+};