ServiceWorker: Make APIs that return ServiceWorkerRegistration coin a new JS object (3/3)

LayoutTests/http/tests/serviceworker/resources/test-helpers.js

Index: LayoutTests/http/tests/serviceworker/resources/test-helpers.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/test-helpers.js b/LayoutTests/http/tests/serviceworker/resources/test-helpers.js
index 2a8e7122565b9f9b7ed39d424b7d3f284bc56c5f..5f9cc5936e34a697d2a32f8974e43acc12b434dc 100644
--- a/LayoutTests/http/tests/serviceworker/resources/test-helpers.js
+++ b/LayoutTests/http/tests/serviceworker/resources/test-helpers.js
@@ -205,3 +205,26 @@ function login_https(test) {
                           'username2s', 'password2s', 'cookie2');
       });
 }
+
+// Helper for testing with ServiceWorkerRegistration objects. Compares simple
+// attributes defined on the interfaces.
+function assert_registration_equals(actual, expected, description) {
+  assert_class_string(actual, 'ServiceWorkerRegistration', description);
+  ['scope', 'installing', 'waiting', 'active'].forEach(function(attribute) {
+      assert_equals(actual[attribute], expected[attribute],
+                    description + ' Attributes differ: ' + attribute + '.');
+    });
+}
+
+// Asserts that two arrays |actual| and |expected| contain the same set of
+// ServiceWorkerRegistration as determined by assert_registration_equals(). The
+// corresponding elements must occupy corresponding indices in their respective
+// arrays.
+function assert_registration_array_equals(actual, expected, description) {
+  assert_true(Array.isArray(actual), description);
+  assert_equals(actual.length, expected.length, description);
+  actual.forEach(function(value, index) {
+      assert_registration_equals(value, expected[index],
+                                 description + ' :  object[' + index + ']');
+    });
+}