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..3ba9272993d8d2abbb025fa3ad8b019f575097ea
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/service_worker/sync/page.js
@@ -0,0 +1,46 @@
+// 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 SYNC_TAG = 'send-chats';
+
+var startServiceWorker = new Promise(function(resolve, reject) {
+  var serviceWorker;
+  var serviceWorkerRegistration;
+  navigator.serviceWorker.register('sw.js').then(function() {
+    // Wait until the service worker is active.
+    return navigator.serviceWorker.ready;
+  }).then(function(registration) {
+    serviceWorker = registration.active;
+    serviceWorkerRegistration = registration;
+    return registration.sync.permissionState();

[Devlin, 2015/11/16 18:12:41]

Could we just return the registration here, and avoid caching it in
serviceWorkerRegistration?

[lazyboy, 2015/11/16 19:30:16]

I want to check permissionState()'s return value and
then call registration.sync.register, so I need to cache it.

+  }).then(function(syncPermissionState) {
+    if (syncPermissionState != 'granted') {
+      reject('permissionState: ' + syncPermissionState);
+    }
+    return serviceWorkerRegistration.sync.register({tag: SYNC_TAG});
+  }).then(function() {
+    resolve(serviceWorker);
+  }).catch(function(err) {
+    reject(err);
+  });
+});
+
+window.runServiceWorker = function() {
+  startServiceWorker.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('message: ' + e.data);
+        chrome.test.sendMessage('FAIL');  // Fails the test fast.
+        return;
+      }
+      chrome.test.sendMessage('' + e.data);

[Devlin, 2015/11/16 18:12:41]

Does just sendMessage(e.data) not work (i.e., do you need the implicit cast to
string)?

[lazyboy, 2015/11/16 19:30:16]

Don't need it, just being safe to force cast, in case e.data is
not string for some reason.
Removed.

+    };
+    serviceWorker.postMessage('connect', [mc.port2]);
+    window.domAutomationController.send('SERVICE_WORKER_READY');
+  }).catch(function(err) {
+    window.domAutomationController.send(err);
+  });
+};