Add UseCounters for CSSStyleSheet IE extensions

Source/core/css/CSSStyleSheet.idl

 /*
  * Copyright (C) 2006, 2007, 2008 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 11 matching lines @@
 [
     GenerateVisitDOMWrapper=ownerNode,
 ] interface CSSStyleSheet : StyleSheet {
     readonly attribute CSSRule          ownerRule;
     readonly attribute CSSRuleList      cssRules;
 
     [RaisesException] unsigned long insertRule(DOMString rule, optional unsigned long index);
     [RaisesException] void deleteRule(unsigned long index);
 
     // IE Extensions
-    readonly attribute CSSRuleList      rules;
+    [MeasureAs=CSSStyleSheetRules] readonly attribute CSSRuleList rules;
 
-    [RaisesException] long addRule([Default=Undefined] optional DOMString selector,
-                 [Default=Undefined] optional DOMString style,
-                 optional unsigned long index);
-    [RaisesException] void removeRule([Default=Undefined] optional unsigned long index);
+    [RaisesException, MeasureAs=CSSStyleSheetAddRule] long addRule([Default=Undefined] optional DOMString selector,
+                                                                   [Default=Undefined] optional DOMString style,
+                                                                   optional unsigned long index);
+    [RaisesException, MeasureAs=CSSStyleSheetRemoveRule] void removeRule([Default=Undefined] optional unsigned long index);
 };
-