Tried to move AudioSummingJuction to oilpan

Source/modules/webaudio/GainNode.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 24 matching lines @@
 namespace WebCore {
 
 GainNode::GainNode(AudioContext* context, float sampleRate)
     : AudioNode(context, sampleRate)
     , m_lastGain(1.0)
     , m_sampleAccurateGainValues(AudioNode::ProcessingSizeInFrames) // FIXME: can probably share temp buffer in context
 {
     ScriptWrappable::init(this);
     m_gain = AudioParam::create(context, "gain", 1.0, 0.0, 1.0);
 
-    addInput(adoptPtr(new AudioNodeInput(this)));
+    addInput(adoptPtrWillBeNoop(new AudioNodeInput(this)));
     addOutput(adoptPtr(new AudioNodeOutput(this, 1)));
 
     setNodeType(NodeTypeGain);
 
     initialize();
 }
 
 void GainNode::process(size_t framesToProcess)
 {
     // FIXME: for some cases there is a nice optimization to avoid processing here, and let the gain change
@@ skipping 45 matching lines @@
 
     if (!isInitialized()) {
         // This will propagate the channel count to any nodes connected further downstream in the graph.
         output(0)->setNumberOfChannels(numberOfChannels);
         initialize();
     }
 
     AudioNode::checkNumberOfChannelsForInput(input);
 }
 
+void GainNode::trace(Visitor* visitor)
+{
+    visitor->trace(m_gain);
+    AudioNode::trace(visitor);
+}
+
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)