Add constructors for WebAudio nodes

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

 /*
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+// See https://webaudio.github.io/web-audio-api/#the-pannernode-interface
 enum PanningModelType {
     "equalpower",
     "HRTF"
 };
 
 enum DistanceModelType {
     "linear",
     "inverse",
     "exponential"
 };
 
 [
-    NoInterfaceObject,
+    Constructor(BaseAudioContext context, optional PannerOptions options),
+    RaisesException=Constructor,
 ] interface PannerNode : AudioNode {
     // Default model for stereo is equalpower.
     attribute PanningModelType panningModel;
 
     // Uses a 3D cartesian coordinate system
     [MeasureAs=PannerNodeSetPosition] void setPosition(float x, float y, float z);
     [MeasureAs=PannerNodeSetOrientation] void setOrientation(float x, float y, float z);
     [DeprecateAs=PannerNodeSetVelocity] void setVelocity(float x, float y, float z);
 
     // Uses a 3D cartesian coordinate system
@@ skipping 10 matching lines @@
 
     attribute double refDistance;
     attribute double maxDistance;
     attribute double rolloffFactor;
 
     // Directional sound cone
     attribute double coneInnerAngle;
     attribute double coneOuterAngle;
     attribute double coneOuterGain;
 };