Add constructors for WebAudio nodes

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

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+[
+    Constructor(AudioContext context, optional AnalyserOptions options),

[hongchan, 2016/09/08 21:41:11]

The spec says BaseAudioContext instead of AudioContext, but it's sort of
nonsensical to use Analyser on the OAC. Still, we should think about this.

[Raymond Toy, 2016/09/08 21:58:00]

I think you're looking at the old version of this file. I updated them all to
say BaseAudioContext.

But with suspend/resume, AnalyserNodes work just fine on offline contexts.

+    RaisesException=Constructor,
+]
 interface AnalyserNode : AudioNode {
     [RaisesException=Setter] attribute unsigned long fftSize;
     readonly attribute unsigned long frequencyBinCount;
 
     // minDecibels / maxDecibels represent the range to scale the FFT analysis data for conversion to unsigned byte values.
     [RaisesException=Setter] attribute double minDecibels;
     [RaisesException=Setter] attribute double maxDecibels;
 
     // A value from 0.0 -> 1.0 where 0.0 represents no time averaging with the last analysis frame.
     [RaisesException=Setter] attribute double smoothingTimeConstant;
 
     // Copies the current frequency data into the passed array.
     // If the array has fewer elements than the frequencyBinCount, the excess elements will be dropped.
     void getFloatFrequencyData(Float32Array array);
     void getByteFrequencyData(Uint8Array array);
 
     // Real-time waveform data
     void getFloatTimeDomainData(Float32Array array);
     void getByteTimeDomainData(Uint8Array array);
 };