Made AudioNode an EventTarget

Source/modules/webaudio/AudioNode.idl

Index: Source/modules/webaudio/AudioNode.idl
diff --git a/Source/modules/webaudio/AudioNode.idl b/Source/modules/webaudio/AudioNode.idl
index a2448c00ddd6cb7f00eedd67c30e87eff3133e72..72213199b5ee3b676dd06cbbff47f3d95a3d1ea5 100644
--- a/Source/modules/webaudio/AudioNode.idl
+++ b/Source/modules/webaudio/AudioNode.idl
@@ -24,7 +24,7 @@
 
 [
     Conditional=WEB_AUDIO
-] interface AudioNode {
+] interface AudioNode : EventTarget {
     readonly attribute AudioContext context;
     readonly attribute unsigned long numberOfInputs;
     readonly attribute unsigned long numberOfOutputs;
@@ -40,4 +40,14 @@
     [RaisesException] void connect(AudioParam? destination, [Default=Undefined] optional unsigned long output);
 
     [RaisesException] void disconnect([Default=Undefined] optional 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);
 };