Merge 142687

Source/WebCore/Modules/webaudio/PannerNode.h

 /*
  * Copyright (C) 2010, 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 136 matching lines @@
     FloatPoint3D m_velocity;
 
     // Gain
     RefPtr<AudioGain> m_distanceGain;
     RefPtr<AudioGain> m_coneGain;
     DistanceEffect m_distanceEffect;
     ConeEffect m_coneEffect;
     float m_lastGain;
 
     unsigned m_connectionCount;
+
+    // Synchronize process() and setPanningModel() which can change the panner.
+    mutable Mutex m_pannerLock;
 };
 
 } // namespace WebCore
 
 #endif // PannerNode_h