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

test/codegen/lib/html/domparser_test.dart

Index: test/codegen/lib/html/domparser_test.dart
diff --git a/test/codegen/lib/html/domparser_test.dart b/test/codegen/lib/html/domparser_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..61ecf86d7de7078324fc2a0da20af2fb8ac72b96
--- /dev/null
+++ b/test/codegen/lib/html/domparser_test.dart
@@ -0,0 +1,17 @@
+library DOMParserTest;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+
+main() {
+
+  useHtmlConfiguration();
+
+  var isDomParser = predicate((x) => x is DomParser, 'is a DomParser');
+
+  test('constructorTest', () {
+      var ctx = new DomParser();
+      expect(ctx, isNotNull);
+      expect(ctx, isDomParser);
+  });
+}