Add support for running browser tests to the test runner.

test/runner/engine_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 'package:unittest/src/backend/declarer.dart';
 import 'package:unittest/src/backend/state.dart';
 import 'package:unittest/src/backend/suite.dart';
 import 'package:unittest/src/runner/engine.dart';
 import 'package:unittest/unittest.dart';
 
 void main() {
   var declarer;
   setUp(() => declarer = new Declarer());
 
   test("runs each test in each suite in order", () {
     var testsRun = 0;
     for (var i = 0; i < 4; i++) {
       declarer.test("test ${i + 1}", expectAsync(() {
         expect(testsRun, equals(i));
         testsRun++;
       }, max: 1));
     }
 
     var engine = new Engine([
-      new Suite("suite 1", declarer.tests.take(2)),
-      new Suite("suite 2", declarer.tests.skip(2))
+      new Suite(declarer.tests.take(2)),
+      new Suite(declarer.tests.skip(2))
     ]);
 
     return engine.run().then((_) => expect(testsRun, equals(4)));
   });
 
   test("emits each test before it starts running and after the previous test "
       "finished", () {
     var testsRun = 0;
     for (var i = 0; i < 3; i++) {
       declarer.test("test ${i + 1}", expectAsync(() => testsRun++, max: 1));
     }
 
-    var engine = new Engine([new Suite("suite", declarer.tests)]);
+    var engine = new Engine([new Suite(declarer.tests)]);
     engine.onTestStarted.listen(expectAsync((liveTest) {
       // [testsRun] should be one less than the test currently running.
       expect(liveTest.test.name, equals("test ${testsRun + 1}"));
 
       // [Engine.onTestStarted] is guaranteed to fire before the first
       // [LiveTest.onStateChange].
       expect(liveTest.onStateChange.first,
           completion(equals(const State(Status.running, Result.success))));
     }, count: 3, max: 3));
 
     return engine.run();
   });
 
   test(".run() returns true if every test passes", () {
     for (var i = 0; i < 2; i++) {
       declarer.test("test ${i + 1}", () {});
     }
 
-    var engine = new Engine([new Suite("suite", declarer.tests)]);
+    var engine = new Engine([new Suite(declarer.tests)]);
     expect(engine.run(), completion(isTrue));
   });
 
   test(".run() returns false if any test fails", () {
     for (var i = 0; i < 2; i++) {
       declarer.test("test ${i + 1}", () {});
     }
     declarer.test("failure", () => throw new TestFailure("oh no"));
 
-    var engine = new Engine([new Suite("suite", declarer.tests)]);
+    var engine = new Engine([new Suite(declarer.tests)]);
     expect(engine.run(), completion(isFalse));
   });
 
   test(".run() returns false if any test errors", () {
     for (var i = 0; i < 2; i++) {
       declarer.test("test ${i + 1}", () {});
     }
     declarer.test("failure", () => throw "oh no");
 
-    var engine = new Engine([new Suite("suite", declarer.tests)]);
+    var engine = new Engine([new Suite(declarer.tests)]);
     expect(engine.run(), completion(isFalse));
   });
 
   test(".run() may not be called more than once", () {
     var engine = new Engine([]);
     expect(engine.run(), completes);
     expect(() => engine.run(), throwsStateError);
   });
 }