WebAudio: Split AudioNode::finishDeref into two parts.

Source/modules/webaudio/AudioContext.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 185 matching lines @@
         ~AutoLocker()
         {
             if (m_mustReleaseLock)
                 m_context->unlock();
         }
     private:
         AudioContext* m_context;
         bool m_mustReleaseLock;
     };
 
-    // In AudioNode::deref() a tryLock() is used for calling finishDeref(), but if it fails keep track here.
+    // In AudioNode::breakConnection() and deref(), a tryLock() is used for
+    // calling actual processing, but if it fails keep track here.
+    void addDeferredBreakConnection(AudioNode&);
     void addDeferredFinishDeref(AudioNode*);
 
-    // In the audio thread at the start of each render cycle, we'll call handleDeferredFinishDerefs().
-    void handleDeferredFinishDerefs();
+    // In the audio thread at the start of each render cycle, we'll call this.
+    void handleDeferredAudioNodeTasks();
 
     // Only accessed when the graph lock is held.
     void markSummingJunctionDirty(AudioSummingJunction*);
     void markAudioNodeOutputDirty(AudioNodeOutput*);
 
     // Must be called on main thread.
     void removeMarkedSummingJunction(AudioSummingJunction*);
 
     // EventTarget
     virtual const AtomicString& interfaceName() const OVERRIDE FINAL;
@@ skipping 78 matching lines @@
     void updateAutomaticPullNodes();
 
     unsigned m_connectionCount;
 
     // Graph locking.
     Mutex m_contextGraphMutex;
     volatile ThreadIdentifier m_audioThread;
     volatile ThreadIdentifier m_graphOwnerThread; // if the lock is held then this is the thread which owns it, otherwise == UndefinedThreadIdentifier
 
     // Only accessed in the audio thread.
+    Vector<AudioNode*> m_deferredBreakConnectionList;
     Vector<AudioNode*> m_deferredFinishDerefList;
 
     RefPtrWillBeMember<AudioBuffer> m_renderTarget;
 
     bool m_isOfflineContext;
 
     AsyncAudioDecoder m_audioDecoder;
 
     // This is considering 32 is large enough for multiple channels audio.
     // It is somewhat arbitrary and could be increased if necessary.
     enum { MaxNumberOfChannels = 32 };
 };
 
 } // WebCore
 
 #endif // AudioContext_h