Split "Online" and "Offline" AudioContext processing

Source/platform/audio/Reverb.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
@@ skipping 27 matching lines @@
 class AudioBus;
 
 // Multi-channel convolution reverb with channel matrixing - one or more ReverbConvolver objects are used internally.
 
 class PLATFORM_EXPORT Reverb {
     WTF_MAKE_NONCOPYABLE(Reverb);
 public:
     enum { MaxFrameSize = 256 };
 
     // renderSliceSize is a rendering hint, so the FFTs can be optimized to not all occur at the same time (very bad when rendering on a real-time thread).
-    Reverb(AudioBus* impulseResponseBuffer, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads, bool normalize);
+    Reverb(AudioBus* impulseResponseBuffer, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool hasRealtimeConstraint, bool normalize);

[Raymond Toy, 2015/06/27 15:38:11]

DBC:  I think useBackgroundThreads is clearer than hasRealtimeConstraints. 
While we don't allow it today, it seems possible that we might want multiple
threads for the reverb, even for offline contexts.

Same comment for ReverbConvolver.h

 
     void process(const AudioBus* sourceBus, AudioBus* destinationBus, size_t framesToProcess);
     void reset();
 
     size_t impulseResponseLength() const { return m_impulseResponseLength; }
     size_t latencyFrames() const;
 
 private:
     void initialize(AudioBus* impulseResponseBuffer, size_t renderSliceSize, size_t maxFFTSize, size_t numberOfChannels, bool useBackgroundThreads);
 
     size_t m_impulseResponseLength;
 
     Vector<OwnPtr<ReverbConvolver>> m_convolvers;
 
     // For "True" stereo processing
     RefPtr<AudioBus> m_tempBuffer;
 };
 
 } // namespace blink
 
 #endif // Reverb_h