Add support for running browser tests to the test runner.

test/backend/invoker_test.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.
 
 import 'dart:async';
 
 import 'package:fake_async/fake_async.dart';
 import 'package:unittest/src/backend/invoker.dart';
 import 'package:unittest/src/backend/state.dart';
 import 'package:unittest/src/backend/suite.dart';
 import 'package:unittest/unittest.dart';
 
 import '../utils.dart';
 
 void main() {
   var suite;
   setUp(() {
     lastState = null;
-    suite = new Suite("suite", []);
+    suite = new Suite([]);
   });
 
   group("Invoker.current", () {
     var invoker = Invoker.current;
     test("returns null outside of a test body", () {
       expect(invoker, isNull);
     });
 
     test("returns the current invoker in a test body", () {
       var invoker;
@@ skipping 456 matching lines @@
       expectErrors(liveTest, [(error) {
         expect(lastState.status, equals(Status.complete));
         expect(error, new isInstanceOf<TimeoutException>());
       }]);
 
       liveTest.run();
       async.elapse(new Duration(seconds: 30));
     });
   });
 }