Add 'Sockets' to observatory.

runtime/bin/vmservice/client/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/elements.dart';
@@ skipping 83 matching lines @@
       case 'HttpServerList':
         IOHttpServerListViewElement element =
             new Element.tag('io-http-server-list-view');
         element.list = object;
         return element;
       case 'HttpServer':
         IOHttpServerViewElement element =
             new Element.tag('io-http-server-view');
         element.httpServer = object;
         return element;
+      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 'Isolate':
         IsolateViewElement element = new Element.tag('isolate-view');
         element.isolate = object;
         return element;
       case 'Library':
         LibraryViewElement element = new Element.tag('library-view');
@@ skipping 52 matching lines @@
     var type = object.serviceType;
     var element = _constructElementForObject();
     if (element == null) {
       Logger.root.info('Unable to find a view element for \'${type}\'');
       return;
     }
     children.add(element);
     Logger.root.info('Viewing object of \'${type}\'');
   }
 }