Made AudioNode an EventTarget

Source/modules/webaudio/AudioNode.idl

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 [
-    Conditional=WEB_AUDIO
+    Conditional=WEB_AUDIO,
+    ActiveDOMObject,
+    EventTarget
 ] interface AudioNode {

[haraken, 2013/04/15 00:01:25]

Can you remove the [EventTarget] IDL attribute by introducing 'interface
AudioNode : EventTarget { ... }' ?

[EventTarget] is deprecated. We want to express inheritance by using inheritance
of IDL interfaces.

     readonly attribute AudioContext context;
     readonly attribute unsigned long numberOfInputs;
     readonly attribute unsigned long numberOfOutputs;
 
     [SetterRaisesException] attribute unsigned long channelCount;
 
     [SetterRaisesException] attribute DOMString channelCountMode;
 
     [SetterRaisesException] attribute DOMString channelInterpretation;
 
     [RaisesException] void connect(AudioNode? destination, [Optional=DefaultIsUndefined] unsigned long output, [Optional=DefaultIsUndefined] unsigned long input);
 
     [RaisesException] void connect(AudioParam? destination, [Optional=DefaultIsUndefined] unsigned long output);
 
     [RaisesException] void disconnect([Optional=DefaultIsUndefined] unsigned long output);
+
+    
+    // EventTarget interface
+    void addEventListener(DOMString type, 
+                          EventListener listener, 
+                          [Optional] boolean useCapture);
+    void removeEventListener(DOMString type, 
+                             EventListener listener, 
+                             [Optional] boolean useCapture);
+    [RaisesException] boolean dispatchEvent(Event event);
 };