Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/mock/mock_window.dart

+part of angular.mock;
+
+@proxy
+class MockWindow extends Mock implements Window {
+  MockHistory history = new MockHistory();
+  MockLocation location = new MockLocation();
+  MockDocument document = new MockDocument();
+
+  dart_async.StreamController<PopStateEvent> onPopStateController =
+      new dart_async.StreamController<PopStateEvent>();
+  dart_async.StreamController<Event> onHashChangeController =
+      new dart_async.StreamController<Event>();
+  dart_async.StreamController<MouseEvent> onClickController =
+      new dart_async.StreamController<MouseEvent>();
+
+
+  dart_async.Stream<PopStateEvent> get onPopState => onPopStateController.stream;
+  dart_async.Stream<Event> get onHashChange => onHashChangeController.stream;
+  dart_async.Stream<Event> get onClick => onClickController.stream;
+
+  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}
+
+@proxy
+class MockHistory extends Mock implements History {
+  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}
+
+@proxy
+class MockLocation extends Mock implements Location {
+  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}
+
+@proxy
+class MockDocument extends Mock implements HtmlDocument {
+  noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}