Add constructors for WebAudio nodes

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

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+// See https://webaudio.github.io/web-audio-api/#AudioParam
 [
 ] interface AudioParam {
     attribute float value;
     readonly attribute float defaultValue;
 
     // Nominal range for the value.
     readonly attribute float minValue;
     readonly attribute float maxValue;
 
     // Parameter automation.
     [RaisesException, MeasureAs=AudioParamSetValueAtTime] AudioParam setValueAtTime(float value, double time);
     [RaisesException, MeasureAs=AudioParamLinearRampToValueAtTime] AudioParam linearRampToValueAtTime(float value, double time);
     [RaisesException, MeasureAs=AudioParamExponentialRampToValueAtTime] AudioParam exponentialRampToValueAtTime(float value, double time);
 
     // Exponentially approach the target with a rate having the given time constant.
     [RaisesException, MeasureAs=AudioParamSetTargetAtTime] AudioParam setTargetAtTime(float target, double time, double timeConstant);
 
     // Sets an array of arbitrary parameter values starting at time for the given duration.
     // The number of values will be scaled to fit into the desired duration.
     [RaisesException, MeasureAs=AudioParamSetValueCurveAtTime] AudioParam setValueCurveAtTime(Float32Array values, double time, double duration);
 
     // Cancels all scheduled parameter changes with times greater than or equal to startTime.
     [RaisesException, MeasureAs=AudioParamCancelScheduledValues] AudioParam cancelScheduledValues(double startTime);
 
 };