Add all dart:html tests from the sdk to test/codegen.

test/codegen/lib/html/worker_api_test.dart

+// Copyright (c) 2012, 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:html';
+import 'dart:isolate';
+
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+
+worker(message) {
+  var uri = message[0];
+  var replyTo = message[1];
+  try {
+    var url = Url.createObjectUrl(new Blob([''], 'application/javascript'));
+    Url.revokeObjectUrl(url);
+    replyTo.send('Hello from Worker');
+  } catch (e) {
+    replyTo.send('Error: $e');
+  }
+}
+
+main() {
+  useHtmlConfiguration();
+
+  test('Use Worker API in Worker', () {
+    var response = new ReceivePort();
+    var remote = Isolate.spawn(worker, ['', response.sendPort]);
+    remote.then((_) => response.first)
+        .then(expectAsync((reply) => expect(reply, equals('Hello from Worker'))));
+  });
+}