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

LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js

 importScripts('interfaces.js');
 importScripts('worker-testharness.js');
 importScripts('/resources/testharness-helpers.js');
 
 var EVENT_HANDLER = 'object';
 
 test(function() {
     verify_interface('ServiceWorkerGlobalScope',
                      self,
                      {
                        scope: 'string',
                        clients: 'object',
                        close: 'function',
+                       skipWaiting: 'function',
 
                        onactivate: EVENT_HANDLER,
                        onfetch: EVENT_HANDLER,
                        oninstall: EVENT_HANDLER,
                        onmessage: EVENT_HANDLER
                      });
   }, 'ServiceWorkerGlobalScope');
 
 test(function() {
     verify_interface('ServiceWorkerClients',
@@ skipping 37 matching lines @@
                              keys: 'function'
                            });
         });
   }, 'Cache');
 
 test(function() {
     assert_equals(new ExtendableEvent('ExtendableEvent').type, 'ExtendableEvent');
     assert_equals(new InstallEvent('InstallEvent').type, 'InstallEvent');
 
   }, 'Event constructors');