[Background Sync] Use Mojo IPC to fire background sync events

content/common/background_sync_service.mojom

 // 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.
 
 module content;
 
 import "content/public/common/background_sync.mojom";
 import "content/public/common/permission_status.mojom";
+import "content/public/common/service_worker_event_status.mojom";
 
 enum BackgroundSyncError {
   NONE,
   STORAGE,
   NOT_FOUND,
   NO_SERVICE_WORKER,
   MAX=NO_SERVICE_WORKER
 };
 
 interface BackgroundSyncService {
   Register(SyncRegistration options, int64 service_worker_registration_id)
       => (BackgroundSyncError err, SyncRegistration options);
   GetRegistration(BackgroundSyncPeriodicity periodicity, string tag,
                   int64 service_worker_registration_id)
       => (BackgroundSyncError err, SyncRegistration? registration);
   GetRegistrations(BackgroundSyncPeriodicity periodicity,
                    int64 service_worker_registration_id)
       => (BackgroundSyncError err, array<SyncRegistration> registrations);
   Unregister(BackgroundSyncPeriodicity periodicity, int64 id, string tag,
              int64 service_worker_registration_id) => (BackgroundSyncError err);
   GetPermissionStatus(BackgroundSyncPeriodicity periodicity,
                       int64 service_worker_registration_id)
       => (BackgroundSyncError err, PermissionStatus status);
 };
 
-interface BackgoundSyncServiceClient {
-  Sync(SyncRegistration event);
+interface BackgroundSyncServiceClient {
+  Sync(SyncRegistration registration, int32 thread_id)
+      => (ServiceWorkerEventStatus status);
 };