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

third_party/WebKit/Source/modules/mediasource/MediaSource.cpp

 /*
  * Copyright (C) 2013 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 75 matching lines @@
 }
 
 MediaSource* MediaSource::create(ExecutionContext* context)
 {
     MediaSource* mediaSource = new MediaSource(context);
     mediaSource->suspendIfNeeded();
     return mediaSource;
 }
 
 MediaSource::MediaSource(ExecutionContext* context)
-    : ActiveDOMObject(context)
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(context)
     , m_readyState(closedKeyword())
     , m_asyncEventQueue(GenericEventQueue::create(this))
     , m_attachedElement(nullptr)
     , m_sourceBuffers(SourceBufferList::create(getExecutionContext(), m_asyncEventQueue.get()))
     , m_activeSourceBuffers(SourceBufferList::create(getExecutionContext(), m_asyncEventQueue.get()))
     , m_isAddedToRegistry(false)
 {
     WTF_LOG(Media, "MediaSource::MediaSource %p", this);
 }
 
@@ skipping 508 matching lines @@
 
     m_asyncEventQueue->enqueueEvent(event.release());
 }
 
 URLRegistry& MediaSource::registry() const
 {
     return MediaSourceRegistry::registry();
 }
 
 } // namespace blink