Add InternetAddress:rawAddress, to return the raw address as a list of bytes.

runtime/bin/socket_patch.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.
 
 patch class RawServerSocket {
   /* patch */ static Future<RawServerSocket> bind(address,
                                                   int port,
                                                   {int backlog: 0,
                                                    bool v6Only: false}) {
     return _RawServerSocket.bind(address, port, backlog, v6Only);
@@ skipping 66 matching lines @@
   final String address;
   final String _host;
   final Uint8List _in_addr;
 
   InternetAddressType get type =>
       _in_addr.length == _IPV4_ADDR_LENGTH ? InternetAddressType.IP_V4
                                            : InternetAddressType.IP_V6;
 
   String get host => _host != null ? _host : address;
 
+  List<int> get rawAddress => new Uint8List.fromList(_in_addr);
+
   bool get isLoopback {
     switch (type) {
       case InternetAddressType.IP_V4:
         return _in_addr[0] == 127;
 
       case InternetAddressType.IP_V6:
         for (int i = 0; i < _IPV6_ADDR_LENGTH - 1; i++) {
           if (_in_addr[i] != 0) return false;
         }
         return _in_addr[_IPV6_ADDR_LENGTH - 1] == 1;
@@ skipping 1492 matching lines @@
 
 Datagram _makeDatagram(List<int> data,
                        String address,
                        List<int> in_addr,
                        int port) {
   return new Datagram(
       data,
       new _InternetAddress(address, null, in_addr),
       port);
 }