ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

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

 /*
  * 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
@@ skipping 106 matching lines @@
   double m_endTime;  // in seconds
 
   static const double UnknownTime;
 
  private:
   // This is accessed by both the main thread and audio thread.  Use the setter
   // and getter to protect the access to this.
   int m_playbackState;
 };
 
-class AudioScheduledSourceNode : public AudioSourceNode,
-                                 public ActiveScriptWrappable {
+class AudioScheduledSourceNode
+    : public AudioSourceNode,
+      public ActiveScriptWrappable<AudioScheduledSourceNode> {
   USING_GARBAGE_COLLECTED_MIXIN(AudioScheduledSourceNode);
 
  public:
   void start(ExceptionState&);
   void start(double when, ExceptionState&);
   void stop(ExceptionState&);
   void stop(double when, ExceptionState&);
 
   EventListener* onended();
   void setOnended(EventListener*);
 
   // ScriptWrappable:
   bool hasPendingActivity() const final;
 
   DEFINE_INLINE_VIRTUAL_TRACE() { AudioSourceNode::trace(visitor); }
 
  protected:
   explicit AudioScheduledSourceNode(BaseAudioContext&);
   AudioScheduledSourceHandler& audioScheduledSourceHandler() const;
 };
 
 }  // namespace blink
 
 #endif  // AudioScheduledSourceNode_h