Use atomics when accessing m_didSetLooping

third_party/WebKit/Source/modules/webaudio/AudioBufferSourceNode.cpp

 /*
  * 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 587 matching lines @@
   // If the source node is not looping, and we have a buffer, we can determine
   // when the source would stop playing.  This is intended to handle the
   // (uncommon) scenario where start() has been called but is never connected to
   // the destination (directly or indirectly).  By stopping the node, the node
   // can be collected.  Otherwise, the node will never get collected, leaking
   // memory.
   //
   // If looping was ever done (m_didSetLooping = true), give up.  We can't
   // easily determine how long we looped so we don't know the actual duration
   // thus far, so don't try to do anything fancy.
-  if (!m_didSetLooping && buffer() && isPlayingOrScheduled() &&
+  if (!didSetLooping() && buffer() && isPlayingOrScheduled() &&
       m_minPlaybackRate > 0) {
     // Adjust the duration to include the playback rate. Only need to account
     // for rate < 1 which makes the sound last longer.  For rate >= 1, the
     // source stops sooner, but that's ok.
     double actualDuration = buffer()->duration() / m_minPlaybackRate;
 
     double stopTime = m_startTime + actualDuration;
 
     // See crbug.com/478301. If a source node is started via start(), the source
     // may not start at that time but one quantum (128 frames) later.  But we
@@ skipping 135 matching lines @@
 
 void AudioBufferSourceNode::start(double when,
                                   double grainOffset,
                                   double grainDuration,
                                   ExceptionState& exceptionState) {
   audioBufferSourceHandler().start(when, grainOffset, grainDuration,
                                    exceptionState);
 }
 
 }  // namespace blink