Add support for WaveShaperNode.oversample

Source/modules/webaudio/WaveShaperNode.h

 /*
  * Copyright (C) 2011, 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 25 matching lines @@
 public:
     static PassRefPtr<WaveShaperNode> create(AudioContext* context)
     {
         return adoptRef(new WaveShaperNode(context));
     }
 
     // setCurve() is called on the main thread.
     void setCurve(Float32Array*);
     Float32Array* curve();
 
+    void setOversample(const String& , ExceptionCode&);
+    String oversample() const;
+
+    double latency() const { return latencyTime(); }
+
 private:    
     explicit WaveShaperNode(AudioContext*);    
 
     WaveShaperProcessor* waveShaperProcessor() { return static_cast<WaveShaperProcessor*>(processor()); }
 };
 
 } // namespace WebCore
 
 #endif // WaveShaperNode_h