Sync the DOM* geometry interfaces with the spec

Source/core/dom/DOMPoint.idl

Index: Source/core/dom/DOMPoint.idl
diff --git a/Source/core/dom/DOMPoint.idl b/Source/core/dom/DOMPoint.idl
index e202163c8a160173277b96225daeb061c2bc5588..8c9932314d933dc6b3e17ef73177ebb9bea8edd4 100644
--- a/Source/core/dom/DOMPoint.idl
+++ b/Source/core/dom/DOMPoint.idl
@@ -2,14 +2,19 @@
 // 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(optional DOMPointInit point),
-    Constructor(unrestricted double x, unrestricted double y,
+    // FIXME: The point argument is optional in the spec:
+    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=28108
+    Constructor(DOMPointInit point),
+    Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
                 optional unrestricted double z = 0, optional unrestricted double w = 1),
+    // FIXME: Exposed=(Window,Worker)
     RuntimeEnabled=GeometryInterfaces,
 ] interface DOMPoint : DOMPointReadOnly {
-    attribute unrestricted double x;
-    attribute unrestricted double y;
-    attribute unrestricted double z;
-    attribute unrestricted double w;
+    inherit attribute unrestricted double x;
+    inherit attribute unrestricted double y;
+    inherit attribute unrestricted double z;
+    inherit attribute unrestricted double w;
 };