Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/directive/ng_non_bindable.dart

+part of angular.directive;
+
+/**
+ * Causes the compiler to ignore all Angular directives and markup on descendant
+ * nodes of the matching element.  Note, however, that other directives and
+ * markup on the element are still processed and that only descending the DOM
+ * for compilation is prevented.
+ *
+ * Example:
+ *
+ *     <div foo="{{a}}" ng-non-bindable>
+ *       <span ng-bind="b"></span>{{b}}
+ *     </div>
+ *
+ * In the above example, because the `div` element has the `ng-non-bindable`
+ * attribute set on it, the `ng-bind` directive and the interpolation for
+ * `{{b}}` are not processed because Angular will not process the `span` child
+ * element.  However, the `foo` attribute *will* be interpolated because it is
+ * not on a child node. 
+ */
+@NgDirective(selector: '[ng-non-bindable]',
+             children: NgAnnotation.IGNORE_CHILDREN)
+class NgNonBindableDirective {}