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 104 matching lines @@
 
     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:
-    void start(ExceptionState&);
-    void start(double when, ExceptionState&);
-    void stop(ExceptionState&);
-    void stop(double when, ExceptionState&);
+    void startNode(ExceptionState&);
+    void startNode(double when, ExceptionState&);
+    void stopNode(ExceptionState&);
+    void stopNode(double when, ExceptionState&);
 
     EventListener* onended();
     void setOnended(PassRefPtrWillBeRawPtr<EventListener>);
 
+    // ScriptWrappable
+    bool hasPendingActivity() const final;
+
+    // It is possible to play a source node for a very long time or to schedule
+    // too far in the future; thus infinitely playing/scheduled sources leak
+    // when the execution context is tearing down because |hasPendingActivity|
+    // returns true.
+    //
+    // So we call |markForGC| to mark the node as 'available for GC' regardless
+    // of its playback state.
+    void markForGC();
+
 protected:
     explicit AudioScheduledSourceNode(AbstractAudioContext&);
     AudioScheduledSourceHandler& audioScheduledSourceHandler() const;
+
+private:
+    bool m_isMarkedForGC;
 };
 
 } // namespace blink
 
 #endif // AudioScheduledSourceNode_h