Add constructors for WebAudio nodes

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

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 // A cached (non-streamed), memory-resident audio source
+// See https://webaudio.github.io/web-audio-api/#AudioBufferSourceNode
 [
+    Constructor(BaseAudioContext context, optional AudioBufferSourceOptions options),
+    RaisesException=Constructor,
     ActiveScriptWrappable,
 ]
 interface AudioBufferSourceNode : AudioSourceNode {
     [RaisesException=Setter] attribute AudioBuffer buffer;
 
     readonly attribute AudioParam playbackRate;
     readonly attribute AudioParam detune;
 
     attribute boolean loop;
     attribute double loopStart;
     attribute double loopEnd;
 
     [RaisesException] void start(optional double when, optional double grainOffset, optional double grainDuration);
     [RaisesException] void stop(optional double when);
 
     attribute EventHandler onended;
 };