Extension SW - add test for ServiceWorkerRegistration.sync.

chrome/test/data/extensions/api_test/service_worker/sync/page.js

Index: chrome/test/data/extensions/api_test/service_worker/sync/page.js
diff --git a/chrome/test/data/extensions/api_test/service_worker/sync/page.js b/chrome/test/data/extensions/api_test/service_worker/sync/page.js
new file mode 100644
index 0000000000000000000000000000000000000000..9bac72b2f8dd0f68ad461f5e8f1479417907297b
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/service_worker/sync/page.js
@@ -0,0 +1,37 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var registerSyncOnServiceWorker = new Promise(function(resolve, reject) {
+  var serviceWorker;
+  navigator.serviceWorker.register('sw.js').then(function() {
+    // Wait until the service worker is active.
+    return navigator.serviceWorker.ready;
+  }).then(function(registration) {
+    serviceWorker = registration.active;
+    return registration.sync.register('send-chats');
+  }).then(function() {
+    resolve(serviceWorker);
+  }).catch(function(err) {
+    reject(err);
+  });
+});
+
+window.runServiceWorker = function() {
+  registerSyncOnServiceWorker.then(function(serviceWorker) {
+    var mc = new MessageChannel();
+    // Called when ServiceWorker.onsync fires.
+    mc.port1.onmessage = function(e) {
+      if (e.data != 'SYNC: send-chats') {
+        console.log('SW returned incorrect data: ' + e.data);
+        chrome.test.sendMessage('FAIL');  // Fails the test fast.
+        return;
+      }
+      chrome.test.sendMessage(e.data);
+    };
+    serviceWorker.postMessage('connect', [mc.port2]);
+    window.domAutomationController.send('SERVICE_WORKER_READY');
+  }).catch(function(err) {
+    window.domAutomationController.send(err);
+  });
+};