Split "Online" and "Offline" AudioContext processing

Source/modules/webaudio/PannerNode.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 89 matching lines @@
     if (!source) {
         destination->zero();
         return;
     }
 
     // The audio thread can't block on this lock, so we call tryLock() instead.
     MutexTryLocker tryLocker(m_processLock);
     MutexTryLocker tryListenerLocker(listener()->listenerLock());
 
     if (tryLocker.locked() && tryListenerLocker.locked()) {
-        // HRTFDatabase should be loaded before proceeding for offline audio context when the panning model is HRTF.
+        // HRTFDatabase should be loaded before proceeding when the panning model is HRTF.
         if (m_panningModel == Panner::PanningModelHRTF && !listener()->isHRTFDatabaseLoaded()) {
-            if (context()->isOfflineContext()) {
-                listener()->waitForHRTFDatabaseLoaderThreadCompletion();
-            } else {
+            if (context()->hasRealtimeConstraint()) {
+                // Some AudioContexts cannot block on the HRTFDatabase loader.
                 destination->zero();
                 return;
             }
+
+            listener()->waitForHRTFDatabaseLoaderThreadCompletion();
         }
 
         // Apply the panning effect.
         double azimuth;
         double elevation;
         azimuthElevation(&azimuth, &elevation);
 
         m_panner->pan(azimuth, elevation, source, destination, framesToProcess);
 
         // Get the distance and cone gain.
@@ skipping 558 matching lines @@
 }
 
 void PannerNode::setConeOuterGain(double gain)
 {
     pannerHandler().setConeOuterGain(gain);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)