Add setNoDelay method on Socket/RawSocket.

sdk/lib/io/http_impl.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.
 
 part of dart.io;
 
 class _HttpIncoming extends Stream<List<int>> {
   final int _transferLength;
   final Completer _dataCompleter = new Completer();
   Stream<List<int>> _stream;
@@ skipping 1208 matching lines @@
         }
         _activeConnections.add(connection);
         return new Future.immediate(new _ConnnectionInfo(connection, proxy));
       }
       return (isSecure && proxy.isDirect
                   ? SecureSocket.connect(host,
                                          port,
                                          sendClientCertificate: true)
                   : Socket.connect(host, port))
         .then((socket) {
+          socket.setOption(SocketOption.TCP_NODELAY, true);
           var connection = new _HttpClientConnection(key, socket, this);
           _activeConnections.add(connection);
           return new _ConnnectionInfo(connection, proxy);
         }, onError: (error) {
           // Continue with next proxy.
           return connect(error.error);
         });
     }
     return connect(new HttpException("No proxies given"));
   }
@@ skipping 142 matching lines @@
 
   _HttpServer.listenOn(ServerSocket this._serverSocket)
       : _closeServer = false;
 
   StreamSubscription<HttpRequest> listen(void onData(HttpRequest event),
                                          {void onError(AsyncError error),
                                          void onDone(),
                                          bool unsubscribeOnError}) {
     _serverSocket.listen(
         (Socket socket) {
+          socket.setOption(SocketOption.TCP_NODELAY, true);
           // Accept the client connection.
           _HttpConnection connection = new _HttpConnection(socket, this);
           _connections.add(connection);
         },
         onError: _controller.addError,
         onDone: _controller.close);
     return _controller.stream.listen(onData,
                                      onError: onError,
                                      onDone: onDone,
                                      unsubscribeOnError: unsubscribeOnError);
@@ skipping 313 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }