Split "Online" and "Offline" AudioContext processing

Source/modules/webaudio/AudioDestinationNode.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 16 matching lines @@
 
 #include "modules/webaudio/AudioBuffer.h"
 #include "modules/webaudio/AudioNode.h"
 #include "platform/audio/AudioBus.h"
 #include "platform/audio/AudioIOCallback.h"
 #include "platform/audio/AudioSourceProvider.h"
 
 namespace blink {
 
 class AudioBus;
-class AudioContext;
+class AbstractAudioContext;
 
 class AudioDestinationHandler : public AudioHandler, public AudioIOCallback {
 public:
     AudioDestinationHandler(AudioNode&, float sampleRate);
     ~AudioDestinationHandler() override;
 
     // AudioHandler
     void process(size_t) final { } // we're pulled by hardware so this is never called
 
     // The audio hardware calls render() to get the next render quantum of audio into destinationBus.
@@ skipping 44 matching lines @@
 };
 
 class AudioDestinationNode : public AudioNode {
     DEFINE_WRAPPERTYPEINFO();
 public:
     AudioDestinationHandler& audioDestinationHandler() const;
 
     unsigned long maxChannelCount() const;
 
 protected:
-    AudioDestinationNode(AudioContext&);
+    AudioDestinationNode(AbstractAudioContext&);
 };
 
 } // namespace blink
 
 #endif // AudioDestinationNode_h