Support for callbacks on ScriptProcessNode.

sdk/lib/web_audio/dartium/web_audio_dartium.dart

Index: sdk/lib/web_audio/dartium/web_audio_dartium.dart
diff --git a/sdk/lib/web_audio/dartium/web_audio_dartium.dart b/sdk/lib/web_audio/dartium/web_audio_dartium.dart
index 9ec6680f49b824679720249ae7dc7d09f2ee21eb..384137e7f018c28d0668313bc145feefb65c8fd5 100644
--- a/sdk/lib/web_audio/dartium/web_audio_dartium.dart
+++ b/sdk/lib/web_audio/dartium/web_audio_dartium.dart
@@ -1117,18 +1117,23 @@ class ScriptProcessorNode extends AudioNode {
             controller.add(audioData);
           }
         };
-      // TODO(podivilov): Implement on Dartium.
-
+      _setEventListener(callback);
       _eventStream = controller.stream;
     }
     return _eventStream;
   }
+
+
   ScriptProcessorNode.internal() : super.internal();
 
   @DomName('ScriptProcessorNode.bufferSize')
   @DocsEditable
   int get bufferSize native "ScriptProcessorNode_bufferSize_Getter";
 
+  @DomName('ScriptProcessorNode._setEventListener')
+  @DocsEditable
+  void _setEventListener(EventListener eventListener) native "ScriptProcessorNode__setEventListener_Callback";
+
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a