Browser side of new ServiceWorker 'sync' event.

content/test/data/service_worker/sync.js

Index: content/test/data/service_worker/sync.js
diff --git a/content/test/data/service_worker/fetch_event.js b/content/test/data/service_worker/sync.js
similarity index 84%
copy from content/test/data/service_worker/fetch_event.js
copy to content/test/data/service_worker/sync.js
index 67408ddd80520ada8c0c0b990ea2a9d681354834..993e771778a505bc5ff78dedbe29a9d5655026fd 100644
--- a/content/test/data/service_worker/fetch_event.js
+++ b/content/test/data/service_worker/sync.js
@@ -2,9 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+var code = 404;
+
 this.onfetch = function(event) {
     response = new Response({
-        statusCode: 200,
+        statusCode: code,
         statusText: 'OK',
         method: 'GET',
         headers: {
@@ -17,3 +19,7 @@ this.onfetch = function(event) {
         setTimeout(function() { r(response); }, 5);
     }));
 };
+
+this.onsync = function(event) {
+    code = 200;
+};