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

test/codegen/lib/html/js_typed_interop_anonymous2_exp_test.dart

Index: test/codegen/lib/html/js_typed_interop_anonymous2_exp_test.dart
diff --git a/test/codegen/lib/html/js_typed_interop_anonymous2_exp_test.dart b/test/codegen/lib/html/js_typed_interop_anonymous2_exp_test.dart
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index 0000000000000000000000000000000000000000..d1db741560433b23d589419e5ec3792ac3e77216
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+++ b/test/codegen/lib/html/js_typed_interop_anonymous2_exp_test.dart
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+// 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.
+//
+// SharedOptions=--experimental-trust-js-interop-type-annotations
+
+// Same test as js_typed_interop_anonymous2, but using the
+// --experimental-trust-js-interop-type-annotations flag.
+@JS()
+library js_typed_interop_anonymous2_exp_test;
+
+import 'dart:html';
+import 'dart:js' as js;
+
+import 'package:js/js.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+
+@JS() @anonymous
+class A {
+  external factory A({B b});
+
+  external B get b;
+}
+
+@JS() @anonymous
+class B {
+  external factory B({C c});
+
+  external C get c;
+}
+
+@JS() @anonymous
+class C {
+  external factory C();
+}
+
+// D is unreachable, and that is OK
+@JS() @anonymous
+class D {
+  external factory D();
+}
+
+main() {
+  useHtmlConfiguration();
+
+  test('simple', () {
+    var b = new B();
+    var a = new A(b: b);
+    expect(a.b, equals(b));
+    expect(b.c, isNull);
+  });
+}