Adding Angular and dependent packages for testing

pkg/third_party/angular_tests/core/registry_test.dart

+/// auto-generated by generate_angular_tests.sh
+
+// Copyright (c) 2014, 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 angular_tests;
+
+import 'package:angular/mock/module.dart';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import '../../../../third_party/pkg/angular/test/core/registry_spec.dart' as test_lib;
+
+main() {
+  useHtmlConfiguration();
+
+  setUp(() {
+    setUpInjector();
+  });
+
+  test_lib.main();
+}
+