ServiceWorker: Add support for .skipWaiting and controllerchange event(3/3)

LayoutTests/http/tests/serviceworker/interfaces.html

Index: LayoutTests/http/tests/serviceworker/interfaces.html
diff --git a/LayoutTests/http/tests/serviceworker/interfaces.html b/LayoutTests/http/tests/serviceworker/interfaces.html
index 7c3a6f1bf6c2af84334e274f1c446330d2442374..33ac472715646a41a547f9e1c8c568bba2a58738 100644
--- a/LayoutTests/http/tests/serviceworker/interfaces.html
+++ b/LayoutTests/http/tests/serviceworker/interfaces.html
@@ -7,11 +7,13 @@
 <script>
 
 test(function() {
+    var EVENT_HANDLER = 'object';
     verify_interface(
       'ServiceWorkerContainer', navigator.serviceWorker,
       {
         register: 'function',
-        getRegistration: 'function'
+        getRegistration: 'function',
+        oncontrollerchange: EVENT_HANDLER
       });
   }, 'Interfaces and attributes of ServiceWorkerContainer');