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

third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 31 matching lines @@
 namespace blink {
 
 MediaStreamTrack* MediaStreamTrack::create(ExecutionContext* context, MediaStreamComponent* component)
 {
     MediaStreamTrack* track = new MediaStreamTrack(context, component);
     track->suspendIfNeeded();
     return track;
 }
 
 MediaStreamTrack::MediaStreamTrack(ExecutionContext* context, MediaStreamComponent* component)
-    : ActiveDOMObject(context)
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(context)
     , m_readyState(MediaStreamSource::ReadyStateLive)
     , m_isIteratingRegisteredMediaStreams(false)
     , m_stopped(false)
     , m_component(component)
 {
     m_component->source()->addObserver(this);
 }
 
 MediaStreamTrack::~MediaStreamTrack()
 {
@@ skipping 196 matching lines @@
 
 DEFINE_TRACE(MediaStreamTrack)
 {
     visitor->trace(m_registeredMediaStreams);
     visitor->trace(m_component);
     RefCountedGarbageCollectedEventTargetWithInlineData<MediaStreamTrack>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink