Allow binding the vm service to IPv6 addresses.

runtime/observatory/tests/service/test_helper.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.
 
 library test_helper;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'package:observatory/service_io.dart';
@@ skipping 263 matching lines @@
   void requestExit() {
     print('** Killing script');
     if (process.kill()) {
       killedByTester = true;
     }
   }
 }
 
 void setupAddresses(Uri serverAddress) {
   serviceWebsocketAddress =
-          'ws://${serverAddress.authority}${serverAddress.path}ws';
+          'ws://${serverAddress.authority}${serverAddress.path}/ws';
   serviceHttpAddress =
       'http://${serverAddress.authority}${serverAddress.path}';
 }
 
 class _ServiceTesterRunner {
   void run({List<String> mainArgs,
             List<VMTest> vmTests,
             List<IsolateTest> isolateTests,
             bool pause_on_start: false,
             bool pause_on_exit: false,
@@ skipping 159 matching lines @@
         mainArgs: mainArgs,
         vmTests: tests,
         pause_on_start: pause_on_start,
         pause_on_exit: pause_on_exit,
         trace_service: trace_service,
         trace_compiler: trace_compiler,
         verbose_vm: verbose_vm,
         pause_on_unhandled_exceptions: pause_on_unhandled_exceptions);
   }
 }