Add new InternetAddress class with a static lookup function (including IPv6 results).

tests/standalone/io/web_socket_test.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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "package:expect/expect.dart";
 import "dart:async";
 import "dart:io";
 import "dart:isolate";
 import "dart:typeddata";
 import "dart:uri";
 
 const String CERT_NAME = 'localhost_cert';
-const String SERVER_ADDRESS = '127.0.0.1';
 const String HOST_NAME = 'localhost';
 
 /**
  * A SecurityConfiguration lets us run the tests over HTTP or HTTPS.
  */
 class SecurityConfiguration {
   final bool secure;
 
   SecurityConfiguration({bool this.secure});
 
   Future<HttpServer> createServer({int backlog: 0}) =>
-      secure ? HttpServer.bindSecure(SERVER_ADDRESS,
+      secure ? HttpServer.bindSecure(HOST_NAME,
                                      0,
                                      backlog: backlog,
                                      certificateName: CERT_NAME)
-             : HttpServer.bind(SERVER_ADDRESS,
+             : HttpServer.bind(HOST_NAME,
                                0,
                                backlog);
 
   Future<WebSocket> createClient(int port) =>
     WebSocket.connect('${secure ? "wss" : "ws"}://$HOST_NAME:$port/');
 
   void testRequestResponseClientCloses(int totalConnections,
                                        int closeStatus,
                                        String closeReason) {
     createServer().then((server) {
@@ skipping 358 matching lines @@
   SecureSocket.initialize(database: testPkcertDatabase.toNativePath(),
                           password: "dartdart");
 }
 
 
 main() {
   new SecurityConfiguration(secure: false).runTests();
   initializeSSL();
   new SecurityConfiguration(secure: true).runTests();
 }