Make the repeating argument to timers optional.

samples/chat/chat_server_lib.dart

 // Copyright (c) 2011, 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("chat_server");
 #import("http.dart");
 #import("../../client/json/dart_json.dart");
 
 typedef void RequestHandler(HTTPRequest request, HTTPResponse response);
 
@@ skipping 573 matching lines @@
 
   void main() {
     _logRequests = false;
     _topic = new Topic();
     _serverStart = new Date.now();
     _messageCount = 0;
     _messageRate = new Rate();
 
     // Start a timer for cleanup events.
     _cleanupTimer =
-        new Timer((timer) => _topic._handleTimer(timer), 10000, true);
+        new Timer.repeating((timer) => _topic._handleTimer(timer), 10000);
 
     // Start timer for periodic logging.
     void _handleLogging(Timer timer) {
       if (_logging) {
         print((_messageRate.rate).toString() +
                        " messages/s (total " +
                        _messageCount +
                        " messages)");
       }
     }
 
     this.port.receive(
         void _(var message, SendPort replyTo) {
           if (message.isStart) {
             _host = message.host;
             _port = message.port;
             _logging = message.logging;
             replyTo.send(new ChatServerStatus.starting(), null);
             _server = new HTTPServer();
             try {
               _server.listen(
                   _host,
                   _port,
                   (HTTPRequest req, HTTPResponse rsp) =>
                       _requestReceivedHandler(req, rsp),
                   backlog: message.backlog);
               replyTo.send(new ChatServerStatus.started(_server.port), null);
-              _loggingTimer = new Timer(_handleLogging, 1000, true);
+              _loggingTimer = new Timer.repeating(_handleLogging, 1000);
             } catch (var e) {
               replyTo.send(new ChatServerStatus.error(e.toString()), null);
             }
           } else if (message.isStop) {
             replyTo.send(new ChatServerStatus.stopping(), null);
             stop();
             replyTo.send(new ChatServerStatus.stopped(), null);
           }
         });
   }
@@ skipping 105 matching lines @@
     }
   }
 
   int _timeRange;
   List<int> _buckets;
   int _currentBucket;
   int _currentBucketTime;
   num _bucketTimeRange;
   int _sum;
 }