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

third_party/WebKit/Source/modules/webaudio/AudioScheduledSourceNode.cpp

 /*
  * Copyright (C) 2012, 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 207 matching lines @@
 {
     ASSERT(isMainThread());
     if (node())
         node()->dispatchEvent(Event::create(EventTypeNames::ended));
 }
 
 // ----------------------------------------------------------------
 
 AudioScheduledSourceNode::AudioScheduledSourceNode(AbstractAudioContext& context)
     : AudioSourceNode(context)
+    , ActiveScriptWrappable(this)
 {
 }
 
 AudioScheduledSourceHandler& AudioScheduledSourceNode::audioScheduledSourceHandler() const
 {
     return static_cast<AudioScheduledSourceHandler&>(handler());
 }
 
 void AudioScheduledSourceNode::start(ExceptionState& exceptionState)
 {
@@ skipping 32 matching lines @@
     if (context()->isContextClosed())
         return false;
 
     // If a node is scheduled or playing, do not collect the node prematurely
     // even its reference is out of scope. Then fire onended event if assigned.
     return audioScheduledSourceHandler().isPlayingOrScheduled();
 }
 
 } // namespace blink