Add UseCounters for the reflected SVGElement.xml* attributes

Source/core/svg/SVGElement.idl

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 interface SVGElement : Element {
-    [Reflect] attribute DOMString xmlbase;
+    [Reflect, MeasureAs=SVGElementXmlbase] attribute DOMString xmlbase;
     readonly attribute SVGSVGElement? ownerSVGElement;
     readonly attribute SVGElement? viewportElement;
 
-    [Reflect] attribute DOMString xmllang;
-    [Reflect] attribute DOMString xmlspace;
+    [Reflect, MeasureAs=SVGElementXmllang] attribute DOMString xmllang;
+    [Reflect, MeasureAs=SVGElementXmlspace] attribute DOMString xmlspace;
 
     [RuntimeEnabled=SVG1DOM, MeasureAs=SVGClassName] readonly attribute SVGAnimatedString className;
 
     readonly attribute CSSStyleDeclaration style;
 
     [CustomElementCallbacks] attribute long tabIndex;
 };
 
 SVGElement implements GlobalEventHandlers;