Adding Angular and dependent packages for testing

third_party/pkg/angular/test/directive/ng_bind_html_spec.dart

+library ng_bind_html_spec;
+
+import '../_specs.dart';
+
+main() {
+  describe('BindHtmlDirective', () {
+    TestBed _;
+
+    beforeEach(inject((TestBed tb) => _ = tb));
+
+    it('should sanitize and set innerHtml and sanitize and set html',
+          inject((Scope scope, Injector injector, Compiler compiler) {
+      var element = $('<div ng-bind-html="htmlVar"></div>');
+      compiler(element)(injector, element);
+      scope.htmlVar = '<a href="http://www.google.com"><b>Google!</b></a>';
+      scope.$digest();
+      // Sanitization removes the href attribute on the <a> tag.
+      expect(element.html()).toEqual('<a><b>Google!</b></a>');
+    }));
+  });
+}