Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/ServiceWorkerGlobalScope/resources/registration-attribute-worker.js

-importScripts('../../resources/test-helpers.js');
+importScripts('../../resources/test-helpers.sub.js');
 importScripts('../../resources/worker-testharness.js');
 
-// TODO(nhiroki): stop using global states because service workers can be killed
-// at any point. Instead, we could post a message to the page on each event via
-// Client object (http://crbug.com/558244).
 var events_seen = [];
 
-// TODO(nhiroki): Move these assertions to registration-attribute.html because
-// an assertion failure on the worker is not shown on the result page and
-// handled as timeout. See registration-attribute-newer-worker.js for example.
-
 assert_equals(
   self.registration.scope,
   normalizeURL('scope/registration-attribute'),
   'On worker script evaluation, registration attribute should be set');
 assert_equals(
   self.registration.installing,
   null,
   'On worker script evaluation, installing worker should be null');
 assert_equals(
   self.registration.waiting,
@@ skipping 107 matching lines @@
       normalizeURL('registration-attribute-worker.js'),
       'On fetch event, active worker should be set');
 
     assert_equals(
       self.registration.active.state,
       'activated',
       'On fetch event, worker should be in the activated state');
 
     e.respondWith(new Response(events_seen));
   });