Support fetching attribute listeners from outside v8 context scopes.

third_party/WebKit/Source/core/events/EventListener.h

 /*
  * Copyright (C) 2006, 2008, 2009 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
@@ skipping 27 matching lines @@
     ImageEventListenerType,
     CPPEventListenerType,
     ConditionEventListenerType,
     NativeEventListenerType,
   };
 
   virtual ~EventListener() {}
   virtual bool operator==(const EventListener&) const = 0;
   virtual void handleEvent(ExecutionContext*, Event*) = 0;
   virtual const String& code() const { return emptyString(); }
-  virtual bool belongsToTheCurrentWorld() const { return false; }
+  virtual bool belongsToTheCurrentWorld(ExecutionContext*) const {
+    return false;
+  }
 
   bool isAttribute() const { return virtualisAttribute(); }
   ListenerType type() const { return m_type; }
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}
 
  protected:
   explicit EventListener(ListenerType type) : m_type(type) {}
 
  private:
   virtual bool virtualisAttribute() const { return false; }
 
   ListenerType m_type;
 };
 
 }  // namespace blink
 
 #endif