Add constructors for WebAudio nodes

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

 /*
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  * Copyright (C) 2011 Apple Inc. All rights reserved.
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+// See https://webaudio.github.io/web-audio-api/#AudioContext
 [
     ActiveScriptWrappable,
     Constructor,
     ConstructorCallWith=Document,
     DependentLifetime,
     NoInterfaceObject,
     RaisesException=Constructor,
 ] interface AudioContext : BaseAudioContext {
     // Sources
     // TODO(rtoy): The following methods should be here instead of in BaseAudioContext:
     //
     // createMediaElementSource(HTMLMediaElement mediaElement)
     // createMediaStreamSource(MediaStream mediaStream)
     // createMediaStreamDestination()
 };