Made AudioNode an EventTarget

Source/modules/webaudio/AudioNode.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 264 matching lines @@
     else
         ec = INVALID_STATE_ERR;
 }
 
 void AudioNode::updateChannelsForInputs()
 {
     for (unsigned i = 0; i < m_inputs.size(); ++i)
         input(i)->changedOutputs();
 }
 
+const AtomicString& AudioNode::interfaceName() const
+{
+    return eventNames().interfaceForAudioNode;
+}
+
+ScriptExecutionContext* AudioNode::scriptExecutionContext() const
+{
+    return const_cast<AudioNode*>(this)->context()->scriptExecutionContext();
+}
+
 void AudioNode::processIfNecessary(size_t framesToProcess)
 {
     ASSERT(context()->isAudioThread());
-    
+
     if (!isInitialized())
         return;
 
     // Ensure that we only process once per rendering quantum.
     // This handles the "fanout" problem where an output is connected to multiple inputs.
     // The first time we're called during this time slice we process, but after that we don't want to re-process,
     // instead our output(s) will already have the results cached in their bus;
     double currentTime = context()->currentTime();
     if (m_lastProcessingTime != currentTime) {
         m_lastProcessingTime = currentTime; // important to first update this time because of feedback loops in the rendering graph
@@ skipping 217 matching lines @@
         fprintf(stderr, "%d: %d\n", i, s_nodeCount[i]);
 
     fprintf(stderr, "===========================\n\n\n");
 }
 
 #endif // DEBUG_AUDIONODE_REFERENCES
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)