Access current frame counter carefully and remove m_cachedSampleFrame.

Source/modules/webaudio/AudioDestinationNode.h

Index: Source/modules/webaudio/AudioDestinationNode.h
diff --git a/Source/modules/webaudio/AudioDestinationNode.h b/Source/modules/webaudio/AudioDestinationNode.h
index bba01f5021d2364fab223bf6c45267f0cf820274..142ee084e4dcf33e042f448fb9d55c34eb478e3a 100644
--- a/Source/modules/webaudio/AudioDestinationNode.h
+++ b/Source/modules/webaudio/AudioDestinationNode.h
@@ -48,7 +48,7 @@ public:
     // It will optionally give us local/live audio input in sourceBus (if it's not 0).
     virtual void render(AudioBus* sourceBus, AudioBus* destinationBus, size_t numberOfFrames) override final;
 
-    size_t currentSampleFrame() const { return m_currentSampleFrame; }
+    size_t currentSampleFrame() const { return acquireLoad(&m_currentSampleFrame); }
     double currentTime() const { return currentSampleFrame() / static_cast<double>(sampleRate()); }
 
     virtual unsigned long maxChannelCount() const { return 0; }