Added support for running dart2js tests on android devices

tools/test.dart

Index: tools/test.dart
diff --git a/tools/test.dart b/tools/test.dart
index 71a3e78e696609178e2006560f135f60d10591ad..089a721a813e77a74a5976daee063982a4259921 100755
--- a/tools/test.dart
+++ b/tools/test.dart
@@ -130,7 +130,7 @@ void testConfigurations(List<Map> configurations) {
       var servers = new TestingServers(new Path(TestUtils.buildDir(conf)),
                                        useContentSecurityPolicy,
                                        conf['runtime']);
-      serverFutures.add(servers.startServers('127.0.0.1'));
+      serverFutures.add(servers.startServers(conf['local_ip']));
       conf['_servers_'] = servers;
     }