[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/core/css/MediaQueryList.idl

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  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.
  */
 
 // http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface
 
 [
+    ActiveScriptWrappable,
     DependentLifetime,
 ] interface MediaQueryList : EventTarget {
     readonly attribute DOMString media;
     readonly attribute boolean matches;
     // Even though this interface is now an event target, these functions
     // exist as aliases for addEventListener for backwards compatibility
     // with older versions of this interface. See the note at
     // http://dev.w3.org/csswg/cssom-view/#dom-mediaquerylist-removelistener
     [ImplementedAs=addDeprecatedListener, Custom=CallEpilogue] void addListener(EventListener? listener);
     [ImplementedAs=removeDeprecatedListener, Custom=CallEpilogue]void removeListener(EventListener? listener);
     attribute EventHandler onchange;
 };