Automatically generate most constructors

client/dom/generated/src/interface/MediaStream.dart

 // 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
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
-interface MediaStream {
+interface MediaStream default _MediaStreamFactoryProvider {
+
+  MediaStream(MediaStreamTrackList audioTracks, MediaStreamTrackList videoTracks);
 
   static final int ENDED = 2;
 
   static final int LIVE = 1;
 
   final MediaStreamTrackList audioTracks;
 
   final String label;
 
   EventListener onended;
 
   final int readyState;
 
   final MediaStreamTrackList videoTracks;
 
   void addEventListener(String type, EventListener listener, [bool useCapture]);
 
   bool dispatchEvent(Event event);
 
   void removeEventListener(String type, EventListener listener, [bool useCapture]);
 }