Adding Angular and dependent packages for testing

third_party/pkg/js/lib/src/wrapping/typed_proxy.dart

Index: third_party/pkg/js/lib/src/wrapping/typed_proxy.dart
diff --git a/third_party/pkg/js/lib/src/wrapping/typed_proxy.dart b/third_party/pkg/js/lib/src/wrapping/typed_proxy.dart
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index 0000000000000000000000000000000000000000..cca120d435a6fdcfba2402e7600a4af17e96125f
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+// Copyright (c) 2013, 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.
+
+part of js.wrapping;
+
+/// base class to wrap a [Proxy] in a strong typed object.
+class TypedProxy implements Serializable<Proxy> {
+  final Proxy $unsafe;
+
+  TypedProxy([Serializable<FunctionProxy> function, List args])
+      : this.fromProxy(new Proxy.withArgList(
+            function != null ? function : context.Object,
+            args != null ? args : []));
+  TypedProxy.fromProxy(this.$unsafe);
+
+  @override dynamic toJs() => $unsafe;
+}