Add remoteHost to Socket.

tests/standalone/src/io/SocketInfoTest.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.
+
+#import("dart:io");
+
+void testHostAndPort() {
+  ServerSocket server = new ServerSocket("127.0.0.1", 0, 5);
+
+  Socket clientSocket = new Socket("127.0.0.1", server.port);
+
+  server.onConnection = (Socket socket) {
+    Expect.equals(socket.port, server.port);
+    Expect.equals(clientSocket.port, socket.remotePort);
+    Expect.equals(clientSocket.remotePort, socket.port);
+    Expect.equals(socket.remoteHost, "127.0.0.1");
+    Expect.equals(clientSocket.remoteHost, "127.0.0.1");
+
+    server.close();
+  };
+}
+
+void main() {
+  testHostAndPort();
+}