Test for register canceling an unregister.

LayoutTests/http/tests/serviceworker/unregister-controller.html

Index: LayoutTests/http/tests/serviceworker/unregister-controller.html
diff --git a/LayoutTests/http/tests/serviceworker/unregister-controller.html b/LayoutTests/http/tests/serviceworker/unregister-controller.html
index 4939a3c29c4de40a316f7d25b64e380e414d5934..c3394fe059341e3f8120071e6e35ecebff9773c7 100644
--- a/LayoutTests/http/tests/serviceworker/unregister-controller.html
+++ b/LayoutTests/http/tests/serviceworker/unregister-controller.html
@@ -68,4 +68,30 @@ async_test(function(t) {
       })
     .catch(unreached_rejection(t));
 }, 'Unregister prevents control of subsequent navigations');
+
+async_test(function(t) {
+    var scope =
+        'scope/no-new-controllee-even-if-registration-is-still-used';
+
+    service_worker_unregister_and_register(t, worker_url, scope)
+      .then(function(registered_worker) {
+          return wait_for_state(t, registered_worker, 'activated');
+        })
+      .then(function() {
+          return with_iframe(scope);
+        })
+      .then(function(frame) {
+          return navigator.serviceWorker.unregister(scope);
+        })
+      .then(function() {
+          return with_iframe(scope);
+        })
+      .then(function(frame) {
+          assert_equals(frame.contentWindow.navigator.serviceWorker.controller,
+                        null,
+                        'document should not have a controller');
+          t.done();
+        })
+      .catch(unreached_rejection(t));
+  }, 'Unregister prevents new controllee even if registration is still in use');
 </script>