Add argument checking to InternetAddress constructor

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 110 matching lines @@
     }
   }
 
   Future<InternetAddress> reverse() => _NativeSocket.reverseLookup(this);
 
   _InternetAddress(String this.address,
                    String this._host,
                    List<int> this._in_addr);
 
   factory _InternetAddress.parse(String address) {
+    if (address is !String) {
+      throw new ArgumentError("Invalid internet address $address");
+    }
     var in_addr = _parse(address);
     if (in_addr == null) {
       throw new ArgumentError("Invalid internet address $address");
     }
     return new _InternetAddress(address, null, in_addr);
   }
 
   factory _InternetAddress.fixed(int id) {
     switch (id) {
       case _ADDRESS_LOOPBACK_IP_V4:
@@ skipping 1404 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);
 }