Support fetching attribute listeners from outside v8 context scopes.

third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 87 matching lines @@
   // Provides access to the underlying handle for GC. Returned
   // value is a weak handle and so not guaranteed to stay alive.
   v8::Persistent<v8::Object>& existingListenerObjectPersistentHandle() {
     return m_listener.get();
   }
 
   bool hasExistingListenerObject() { return !m_listener.isEmpty(); }
 
   void clearListenerObject();
 
-  bool belongsToTheCurrentWorld() const final;
+  bool belongsToTheCurrentWorld(ExecutionContext*) const final;
   v8::Isolate* isolate() const { return m_isolate; }
   DOMWrapperWorld& world() const { return *m_world; }
 
   DECLARE_VIRTUAL_TRACE();
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  protected:
   V8AbstractEventListener(bool isAttribute, DOMWrapperWorld&, v8::Isolate*);
 
   virtual v8::Local<v8::Object> getListenerObjectInternal(
@@ skipping 32 matching lines @@
 
   // nullptr unless this listener belongs to a worker.
   Member<WorkerGlobalScope> m_workerGlobalScope;
 
   SelfKeepAlive<V8AbstractEventListener> m_keepAlive;
 };
 
 }  // namespace blink
 
 #endif  // V8AbstractEventListener_h