Keep AudioSourceNode from premature GC with ScriptWrappable::hasPendingActivity()

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 112 matching lines @@
 class AudioScheduledSourceNode : public AudioSourceNode {
 public:
     void start(ExceptionState&);
     void start(double when, ExceptionState&);
     void stop(ExceptionState&);
     void stop(double when, ExceptionState&);
 
     EventListener* onended();
     void setOnended(PassRefPtrWillBeRawPtr<EventListener>);
 
+    // ScriptWrappable
+    bool hasPendingActivity() const final;
+
 protected:
     explicit AudioScheduledSourceNode(AbstractAudioContext&);
     AudioScheduledSourceHandler& audioScheduledSourceHandler() const;
 };
 
 } // namespace blink
 
 #endif // AudioScheduledSourceNode_h