Adding Angular and dependent packages for testing

third_party/pkg/route_hierarchical/example/full/company-info-loader.dart

+library company_info_loader;
+
+import 'dart:html';
+
+import 'package:web_ui/web_ui.dart';
+import 'package:route_hierarchical/client.dart';
+
+import 'data.dart' as data;
+
+
+class CompanyInfoLoaderComponent extends WebComponent {
+  RouteHandle route;
+  @observable var company;
+  @observable Route companyRoute;
+
+  inserted() {
+    companyRoute = route.getRoute('companyId');
+    companyRoute.onRoute.listen(_showCompanyInfo);
+  }
+
+  removed() {
+    route.discard();
+  }
+
+  _showCompanyInfo(RouteEvent e) {
+    var tokenInt = int.parse(e.parameters['companyId'], onError: (s) => -1);
+    if (tokenInt > -1) {
+      data.fetchCompany(tokenInt).then((result) {
+        if (result == null) {
+          window.alert('Unable to fetch company $tokenInt');
+        }
+        company = result;
+      });
+    } else {
+      // TODO: navigate to invalid company route...
+      window.alert('Invalid company id $tokenInt');
+    }
+  }
+}