Add constructors for WebAudio nodes

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

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+// See https://webaudio.github.io/web-audio-api/#AudioListener
 interface AudioListener {
     [DeprecateAs=AudioListenerDopplerFactor] attribute float dopplerFactor;  // same as OpenAL (default 1.0)
     [DeprecateAs=AudioListenerSpeedOfSound] attribute float speedOfSound;   // in meters / second (default 343.3)
 
     [MeasureAs=AudioListenerSetPosition] void setPosition(float x, float y, float z);
     [MeasureAs=AudioListenerSetOrientation] void setOrientation(float x, float y, float z, float xUp, float yUp, float zUp);
     [DeprecateAs=AudioListenerSetVelocity] void setVelocity(float x, float y, float z);
 
     // Location of the listener
     readonly attribute AudioParam positionX;
     readonly attribute AudioParam positionY;
     readonly attribute AudioParam positionZ;
 
     // Forward direction vector of the listener
     readonly attribute AudioParam forwardX;
     readonly attribute AudioParam forwardY;
     readonly attribute AudioParam forwardZ;
 
     // Up direction vector for the listener
     readonly attribute AudioParam upX;
     readonly attribute AudioParam upY;
     readonly attribute AudioParam upZ;
 };