Add cross-origin test with credentials.

tests/html/xhr_cross_origin_test.dart

Index: tests/html/xhr_cross_origin_test.dart
diff --git a/tests/html/xhr_cross_origin_test.dart b/tests/html/xhr_cross_origin_test.dart
index d39af2c85e388bcfdb6e6e60f0f352ff50b9f429..e01b285cfa14c7af836760bbba57935161f175c1 100644
--- a/tests/html/xhr_cross_origin_test.dart
+++ b/tests/html/xhr_cross_origin_test.dart
@@ -11,8 +11,10 @@ import 'dart:json';
 main() {
   useHtmlConfiguration();
 
+  var port = getCrossOriginPortNumber();
+
   test('XHR Cross-domain', () {
-    var url = "http://localhost:9876/tests/html/xhr_cross_origin_data.txt";
+    var url = "http://localhost:$port/tests/html/xhr_cross_origin_data.txt";
     var xhr = new HttpRequest();
     xhr.open('GET', url, true);
     var validate = expectAsync1((data) {
@@ -31,7 +33,7 @@ main() {
   });
 
   test('XHR.get Cross-domain', () {
-    var url = "http://localhost:9876/tests/html/xhr_cross_origin_data.txt";
+    var url = "http://localhost:$port/tests/html/xhr_cross_origin_data.txt";
     new HttpRequest.get(url, expectAsync1((xhr) {
       var data = JSON.parse(xhr.response);
       expect(data, contains('feed'));
@@ -39,4 +41,14 @@ main() {
       expect(data, isMap);
     }));
   });
+
+  test('XHR.getWithCredentials Cross-domain', () {
+    var url = "http://localhost:$port/tests/html/xhr_cross_origin_data.txt";
+    new HttpRequest.getWithCredentials(url, expectAsync1((xhr) {
+      var data = JSON.parse(xhr.response);
+      expect(data, contains('feed'));
+      expect(data['feed'], contains('entry'));
+      expect(data, isMap);
+    }));
+  });
 }