Split "Online" and "Offline" AudioContext processing

Source/modules/webaudio/ChannelMergerNode.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 16 matching lines @@
  */
 
 #ifndef ChannelMergerNode_h
 #define ChannelMergerNode_h
 
 #include "modules/webaudio/AudioNode.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
-class AudioContext;
+class AbstractAudioContext;
 
 class ChannelMergerHandler final : public AudioHandler {
 public:
     static PassRefPtr<ChannelMergerHandler> create(AudioNode&, float sampleRate, unsigned numberOfInputs);
 
     void process(size_t framesToProcess) override;
     void setChannelCount(unsigned long, ExceptionState&) final;
     void setChannelCountMode(const String&, ExceptionState&) final;
 
 private:
     ChannelMergerHandler(AudioNode&, float sampleRate, unsigned numberOfInputs);
 };
 
 class ChannelMergerNode final : public AudioNode {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static ChannelMergerNode* create(AudioContext&, float sampleRate, unsigned numberOfInputs);
+    static ChannelMergerNode* create(AbstractAudioContext&, float sampleRate, unsigned numberOfInputs);
 
 private:
-    ChannelMergerNode(AudioContext&, float sampleRate, unsigned numberOfInputs);
+    ChannelMergerNode(AbstractAudioContext&, float sampleRate, unsigned numberOfInputs);
 };
 
 } // namespace blink
 
 #endif // ChannelMergerNode_h