Split the constructors group in element_types_test into multiple files to narrow down timeouts

tests/html/element_types_constructors1_test.dart

Index: tests/html/element_types_constructors1_test.dart
diff --git a/tests/html/element_types_constructors1_test.dart b/tests/html/element_types_constructors1_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2c96ee8428c54721614a424dcda585e08e4a452d
--- /dev/null
+++ b/tests/html/element_types_constructors1_test.dart
@@ -0,0 +1,40 @@
+// 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.
+
+library element_types_constructors1_test;
+
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_individual_config.dart';
+import 'dart:html';
+
+main() {
+  check(String name, bool fn(), [bool supported = true]) {
+    test(name, () {
+      var expectation = supported ? returnsNormally : throws;
+      expect(() {
+        expect(fn(), isTrue);
+      }, expectation);
+    });
+  }
+
+  check('a', () => new AnchorElement() is AnchorElement);
+  check('area', () => new AreaElement() is AreaElement);
+  check('audio', () => new AudioElement() is AudioElement);
+  check('body', () => new BodyElement() is BodyElement);
+  check('br', () => new BRElement() is BRElement);
+  check('base', () => new BaseElement() is BaseElement);
+  check('button', () => new ButtonElement() is ButtonElement);
+  check('canvas', () => new CanvasElement() is CanvasElement);
+  check('caption', () => new TableCaptionElement() is TableCaptionElement);
+  check('content',
+      () => new ContentElement() is ContentElement, ContentElement.supported);
+  check('details', () => new DetailsElement() is DetailsElement,
+      DetailsElement.supported);
+  check('datalist', () => new DataListElement() is DataListElement,
+      DataListElement.supported);
+  check('dl', () => new DListElement() is DListElement);
+  check('div', () => new DivElement() is DivElement);
+  check('embed',
+      () => new EmbedElement() is EmbedElement, EmbedElement.supported);
+}