Add a class to start and stop a Chrome process.

lib/src/util/io.dart

 // Copyright (c) 2015, 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 unittest.util.io;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
@@ skipping 35 matching lines @@
 /// [fn] completes to.
 Future withTempDir(Future fn(String path)) {
   return new Future.sync(() {
     // TODO(nweiz): Empirically test whether sync or async functions perform
     // better here when starting a bunch of isolates.
     var tempDir = Directory.systemTemp.createTempSync('unittest_');
     return new Future.sync(() => fn(tempDir.path))
         .whenComplete(() => tempDir.deleteSync(recursive: true));
   });
 }
+
+/// Creates a URL string for [address]:[port].
+///
+/// Handles properly formatting IPv6 addresses.
+Uri baseUrlForAddress(InternetAddress address, int port) {
+  if (address.isLoopback) {
+    return new Uri(scheme: "http", host: "localhost", port: port);
+  }
+
+  // IPv6 addresses in URLs need to be enclosed in square brackets to avoid
+  // URL ambiguity with the ":" in the address.
+  if (address.type == InternetAddressType.IP_V6) {
+    return new Uri(scheme: "http", host: "[${address.address}]", port: port);
+  }
+
+  return new Uri(scheme: "http", host: address.address, port: port);
+}