Add constructors for WebAudio nodes

third_party/WebKit/Source/modules/webaudio/OscillatorNode.idl

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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+// See https://webaudio.github.io/web-audio-api/#the-oscillatornode-interface
 enum OscillatorType {
     "sine",
     "square",
     "sawtooth",
     "triangle",
     "custom"
 };
 
 // OscillatorNode is an audio generator of periodic waveforms.
 [
-    ActiveScriptWrappable,
+    Constructor(BaseAudioContext context, optional OscillatorOptions options),
+    RaisesException=Constructor,
+    ActiveScriptWrappable,    
 ]
 interface OscillatorNode : AudioSourceNode {
 
     [RaisesException=Setter] attribute OscillatorType type;
 
     readonly attribute AudioParam frequency; // in Hertz
     readonly attribute AudioParam detune; // in Cents
 
     [RaisesException] void start(optional double when);
     [RaisesException] void stop(optional double when);
 
     void setPeriodicWave(PeriodicWave periodicWave);
 
     attribute EventHandler onended;
 };