Update Timer API to take the callback as the last parameter.

samples/chat/chat_server_lib.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.
 
 #library("chat_server");
 #import("dart:io");
 #import("dart:isolate");
 #import("dart:json");
 
 typedef void RequestHandler(HttpRequest request, HttpResponse response);
@@ skipping 548 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.repeating((timer) => _topic._handleTimer(timer), 10000);
+        new Timer.repeating(10000, (timer) => _topic._handleTimer(timer));
 
     // Start timer for periodic logging.
     void _handleLogging(Timer timer) {
       if (_logging) {
         print((_messageRate.rate).toString() +
                        " messages/s (total " +
                        _messageCount +
                        " messages)");
       }
     }
 
     this.port.receive((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, backlog: message.backlog);
           _server.onRequest = (HttpRequest req, HttpResponse rsp) =>
               _requestReceivedHandler(req, rsp);
           replyTo.send(new ChatServerStatus.started(_server.port), null);
-          _loggingTimer = new Timer.repeating(_handleLogging, 1000);
+          _loggingTimer = new Timer.repeating(1000, _handleLogging);
         } 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;
 }