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

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

Index: third_party/WebKit/Source/modules/webaudio/AudioScheduledSourceNode.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioScheduledSourceNode.h b/third_party/WebKit/Source/modules/webaudio/AudioScheduledSourceNode.h
index ed6a5300de45d6b370c3d958f7d13e75e6beef13..2b7d1d7f6aa515d2fd3798aae931ed52366f0914 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioScheduledSourceNode.h
+++ b/third_party/WebKit/Source/modules/webaudio/AudioScheduledSourceNode.h
@@ -122,17 +122,32 @@ private:
 
 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