Use mojo to connect to BackgroundSyncManager object

content/test/data/background_sync/service_worker.js

 // 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.
 
 // The "onsync" event currently understands commands (passed as
 // registration tags) coming from the test. Any other tag is
 // passed through to the document unchanged.
 //
 // "delay" - Delays finishing the sync event with event.waitUntil.
 //           Send a postMessage of "completeDelayedOneShot" to finish the
@@ skipping 34 matching lines @@
         sendMessageToClients('sync', 'ok - ' + tag + ' done');
         return syncRegistration.done;
       })
       .then(function(success) {
         sendMessageToClients('sync', tag + " done result: " + success);
       }, function(error) {
         sendMessageToClients('sync', tag + " done result: error");
       })
       .catch(sendSyncErrorToClients);
   }
+
+  if (event.data['action'] === 'registerOneShot') {
+    var tag = event.data['tag'];
+    registration.sync.register({'tag': tag})
+      .then(function (syncRegistration) {
+        sendMessageToClients('register', 'ok - ' + tag + ' registered in SW');
+      })
+      .catch(sendSyncErrorToClients);
+  }
+
+  if (event.data['action'] === 'getRegistrationOneShot') {
+    var tag = event.data['tag'];
+    registration.sync.getRegistration(tag)
+      .then(function(syncRegistration) {
+        if (!syncRegistration) {
+          sendMessageToClients('register', 'error - ' + tag + ' not found');
+          return;
+        }
+        sendMessageToClients('register', 'ok - ' + tag + ' found');
+      })
+      .catch(sendSyncErrorToClients);
+  }
+
+  if (event.data['action'] === 'getRegistrationsOneShot') {
+    registration.sync.getRegistrations()
+      .then(function(syncRegistrations) {
+        var tags = syncRegistrations.map(function(syncRegistration) {
+          return syncRegistration.tag;
+        });
+        sendMessageToClients('register', 'ok - ' + tags.toString());
+      })
+      .catch(sendSyncErrorToClients);
+  }
 }
 
 this.onsync = function(event) {
   var eventProperties = [
     // Extract name from toString result: "[object <Class>]"
     Object.prototype.toString.call(event).match(/\s([a-zA-Z]+)/)[1],
     (typeof event.waitUntil)
   ];
 
   if (eventProperties[0] != 'SyncEvent') {
@@ skipping 43 matching lines @@
       client.postMessage({type, data});
     });
   }, function(error) {
     console.log(error);
   });
 }
 
 function sendSyncErrorToClients(error) {
   sendMessageToClients('sync', error.name + ' - ' + error.message);
 }