Add constructors for WebAudio nodes

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

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-interface AudioBuffer {
+// See https://webaudio.github.io/web-audio-api/#AudioBuffer
+[
+    Constructor(BaseAudioContext context, AudioBufferOptions options),
+    RaisesException=Constructor,
+] interface AudioBuffer {
     readonly attribute long length; // in sample-frames
     readonly attribute double duration; // in seconds
     readonly attribute float sampleRate; // in sample-frames per second
 
     // Channel access
     readonly attribute unsigned long numberOfChannels;
     [RaisesException] Float32Array getChannelData(unsigned long channelIndex);
     [RaisesException] void copyFromChannel(Float32Array destination, long channelNumber, optional unsigned long startInChannel = 0);
     [RaisesException] void copyToChannel(Float32Array source, long channelNumber, optional unsigned long startInChannel = 0);
 };