Generate eventListenerCacheIndex if an EventListener is present

Source/core/page/Performance.idl

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 12 matching lines @@
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 // See: http://dev.w3.org/2006/webapi/WebTiming/
-[
-    EventTarget
-] interface Performance {
+interface Performance {
     readonly attribute PerformanceNavigation navigation;
     readonly attribute PerformanceTiming timing;
     readonly attribute MemoryInfo memory;
 
     [MeasureAs=UnprefixedPerformanceTimeline] sequence<PerformanceEntry> getEntries();
     [MeasureAs=UnprefixedPerformanceTimeline] sequence<PerformanceEntry> getEntriesByType(DOMString entryType);
     [MeasureAs=UnprefixedPerformanceTimeline] sequence<PerformanceEntry> getEntriesByName(DOMString name, [Default=NullString] optional DOMString entryType);
     [DeprecateAs=PrefixedPerformanceTimeline,ImplementedAs=getEntries] sequence<PerformanceEntry> webkitGetEntries();
     [DeprecateAs=PrefixedPerformanceTimeline,ImplementedAs=getEntriesByType] sequence<PerformanceEntry> webkitGetEntriesByType(DOMString entryType);
     [DeprecateAs=PrefixedPerformanceTimeline,ImplementedAs=getEntriesByName] sequence<PerformanceEntry> webkitGetEntriesByName(DOMString name, [Default=NullString] optional DOMString entryType);
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     [RaisesException,DeprecateAs=PrefixedUserTiming,ImplementedAs=mark] void webkitMark(DOMString markName);
     [DeprecateAs=PrefixedUserTiming,ImplementedAs=clearMarks] void webkitClearMarks([Default=NullString] optional  DOMString markName);
 
     [RaisesException,DeprecateAs=PrefixedUserTiming,ImplementedAs=measure] void webkitMeasure(DOMString measureName, [Default=NullString] optional DOMString startMark, [Default=NullString] optional DOMString endMark);
     [DeprecateAs=PrefixedUserTiming,ImplementedAs=clearMeasures] void webkitClearMeasures([Default=NullString] optional DOMString measureName);
 
     // See http://www.w3.org/TR/hr-time/ for details.
     double now();
 };