test(introspection): Make introspection work with Polymer polyfills
test(introspection): Make introspection work with Polymer polyfills

For #801

ronlobo/angular.dart,SibuStephen/angular.dart,hitesh97/angular.dart,trinarytree/angular.dart,ronlobo/angular.dart,ronlobo/angular.dart,winstonewert/angular.dart,hitesh97/angular.dart,SibuStephen/angular.dart,winstonewert/angular.dart,rkirov/angular.dart,SibuStephen/angular.dart,SibuStephen/angular.dart,ronlobo/angular.dart,giovannicandido/angular.dart,hitesh97/angular.dart,winstonewert/angular.dart,trinarytree/angular.dart,giovannicandido/angular.dart,trinarytree/angular.dart,trinarytree/angular.dart,giovannicandido/angular.dart,winstonewert/angular.dart,rkirov/angular.dart,rkirov/angular.dart,hitesh97/angular.dart,rkirov/angular.dart