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

test/codegen/lib/html/media_stream_test.dart

+// Copyright (c) 2011, 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 media_stream_test;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_individual_config.dart';
+import 'dart:html';
+
+main() {
+  useHtmlIndividualConfiguration();
+
+  group('supported_media', () {
+    test('supported', () {
+      expect(MediaStream.supported, true);
+    });
+  });
+
+  group('supported_MediaStreamEvent', () {
+    test('supported', () {
+      expect(MediaStreamEvent.supported, true);
+    });
+  });
+
+  group('supported_MediaStreamTrackEvent', () {
+    test('supported', () {
+      expect(MediaStreamTrackEvent.supported, true);
+    });
+  });
+
+  group('constructors', () {
+    test('MediaStreamEvent', () {
+      var expectation = MediaStreamEvent.supported ? returnsNormally : throws;
+      expect(() {
+        var event = new Event.eventType('MediaStreamEvent', 'media');
+        expect(event is MediaStreamEvent, isTrue);
+      }, expectation);
+    });
+
+    test('MediaStreamTrackEvent', () {
+      var expectation =
+          MediaStreamTrackEvent.supported ? returnsNormally : throws;
+      expect(() {
+        var event = new Event.eventType('MediaStreamTrackEvent', 'media');
+        expect(event is MediaStreamTrackEvent, isTrue);
+      }, expectation);
+    });
+  });
+}