Adding streams to dart:html.

sdk/lib/web_audio/dart2js/web_audio_dart2js.dart

Index: sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
diff --git a/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart b/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
index cc6faf77a7c4e53ab57c4315a01d87b8ad7086e8..b016061c36737a6feea173e837cfa58ee4a8458e 100644
--- a/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
+++ b/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
@@ -1,5 +1,6 @@
 library web_audio;
 
+import 'dart:async';
 import 'dart:html';
 // DO NOT EDIT
 // Auto-generated dart:audio library.
@@ -149,6 +150,8 @@ class AudioBufferSourceNode extends AudioSourceNode native "*AudioBufferSourceNo
 /// @domName AudioContext
 class AudioContext extends EventTarget native "*AudioContext" {
 
+  static const EventStreamProvider<Event> completeEvent = const EventStreamProvider<Event>('complete');
+
   ///@docsEditable true
   factory AudioContext() => AudioContext._create();
 
@@ -225,6 +228,8 @@ class AudioContext extends EventTarget native "*AudioContext" {
   /// @domName AudioContext.startRendering; @docsEditable true
   void startRendering() native;
 
+  Stream<Event> get onComplete => completeEvent.forTarget(this);
+
   static AudioContext _create() => JS('AudioContext',
       'new (window.AudioContext || window.webkitAudioContext)()');