Add constructors for WebAudio nodes

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

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+// See http://webaudio.github.io/web-audio-api/#idl-def-AudioNode
 enum ChannelCountMode {
     "max",
     "clamped-max",
     "explicit"
 };
 
 enum ChannelInterpretation {
     "speakers",
     "discrete"
 };
 
-// http://webaudio.github.io/web-audio-api/#idl-def-AudioNode
-
 interface AudioNode : EventTarget {
     [RaisesException, MeasureAs=AudioNodeConnectToAudioNode] AudioNode connect(AudioNode destination, optional unsigned long output = 0, optional unsigned long input = 0);
     [RaisesException, MeasureAs=AudioNodeConnectToAudioParam] void connect(AudioParam destination, optional unsigned long output = 0);
     void disconnect();
     [RaisesException, MeasureAs=AudioNodeDisconnectFromAudioNode] void disconnect(unsigned long output);
     [RaisesException, MeasureAs=AudioNodeDisconnectFromAudioNode] void disconnect(AudioNode destination);
     [RaisesException, MeasureAs=AudioNodeDisconnectFromAudioNode] void disconnect(AudioNode destination, unsigned long output);
     [RaisesException, MeasureAs=AudioNodeDisconnectFromAudioNode] void disconnect(AudioNode destination, unsigned long output, unsigned long input);
     [RaisesException, MeasureAs=AudioNodeDisconnectFromAudioParam] void disconnect(AudioParam destination);
     [RaisesException, MeasureAs=AudioNodeDisconnectFromAudioParam] void disconnect(AudioParam destination, unsigned long output);
     readonly attribute BaseAudioContext context;
     readonly attribute unsigned long numberOfInputs;
     readonly attribute unsigned long numberOfOutputs;
     [RaisesException=Setter] attribute unsigned long         channelCount;
     [RaisesException=Setter] attribute ChannelCountMode      channelCountMode;
     [RaisesException=Setter] attribute ChannelInterpretation channelInterpretation;
 };