Add UseCounter for Element.createShadowRoot()

Source/core/dom/Element.idl

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * 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,
@@ skipping 90 matching lines @@
 
     [Reflect=class] attribute DOMString className;
     [PerWorldBindings] readonly attribute DOMTokenList classList;
 
     [PerWorldBindings] readonly attribute DOMStringMap dataset;
 
     // WebKit extension
     [RaisesException, ImplementedAs=matches, MeasureAs=ElementPrefixedMatchesSelector] boolean webkitMatchesSelector(DOMString selectors);
 
     // Shadow DOM API
-    [RaisesException] ShadowRoot createShadowRoot();
+    [RaisesException, MeasureAs=ElementCreateShadowRoot] ShadowRoot createShadowRoot();
     [PerWorldBindings] readonly attribute ShadowRoot shadowRoot;
     [PerWorldBindings] NodeList getDestinationInsertionPoints();
 
     // CSSOM View Module API
     ClientRectList getClientRects();
     ClientRect getBoundingClientRect();
 
     // Mozilla version
     const unsigned short ALLOW_KEYBOARD_INPUT = 1;
     [PerWorldBindings, LogActivity, LogAllWorlds, MeasureAs=PrefixedElementRequestFullScreen] void webkitRequestFullScreen([Default=Undefined] optional unsigned short flags);
@@ skipping 17 matching lines @@
     [RuntimeEnabled=Touch] attribute EventHandler ontouchend;
     [RuntimeEnabled=Touch] attribute EventHandler ontouchmove;
     [RuntimeEnabled=Touch] attribute EventHandler ontouchstart;
     attribute EventHandler onwebkitfullscreenchange;
     attribute EventHandler onwebkitfullscreenerror;
     [PerWorldBindings, LogActivity=SetterOnly] attribute EventHandler onwheel;
 };
 
 Element implements ParentNode;
 Element implements ChildNode;