Make VM event streams look like real dart streams.

runtime/observatory/lib/src/elements/service_view.dart

 // Copyright (c) 2013, 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.
 
 library service_object_view_element;
 
 import 'dart:html';
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
 import 'package:observatory/tracer.dart';
@@ skipping 79 matching lines @@
             return element;
           case 'ObjectPool':
             ObjectPoolViewElement element = new Element.tag('objectpool-view');
             element.pool = object;
             return element;
           default:
             ObjectViewElement element = new Element.tag('object-view');
             element.object = object;
             return element;
         }
+        break;
       case 'SocketList':
         IOSocketListViewElement element =
             new Element.tag('io-socket-list-view');
         element.list = object;
         return element;
       case 'Socket':
         IOSocketViewElement element = new Element.tag('io-socket-view');
         element.socket = object;
         return element;
       case 'WebSocketList':
@@ skipping 117 matching lines @@
 
   dynamic expander() {
     return expandEvent;
   }
 
   void expandEvent(bool exp, var done) {
     expand = exp;
     done();
   }
 }