Implement a poor man's PostAfterStartupTask() function.

content/browser/service_worker/service_worker_register_job.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTER_JOB_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTER_JOB_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
 #include "content/browser/service_worker/embedded_worker_instance.h"
 #include "content/browser/service_worker/service_worker_register_job_base.h"
 #include "content/browser/service_worker/service_worker_registration.h"
 #include "content/common/service_worker/service_worker_status_code.h"
+#include "content/public/browser/browser_main_runner.h"
 #include "url/gurl.h"
 
 namespace content {
 
 class ServiceWorkerJobCoordinator;
 class ServiceWorkerStorage;
 
 // Handles the initial registration of a Service Worker and the
 // subsequent update of existing registrations.
 //
@@ skipping 72 matching lines @@
     scoped_refptr<ServiceWorkerVersion> new_version;
   };
 
   void set_registration(
       const scoped_refptr<ServiceWorkerRegistration>& registration);
   ServiceWorkerRegistration* registration();
   void set_new_version(ServiceWorkerVersion* version);
   ServiceWorkerVersion* new_version();
 
   void SetPhase(Phase phase);
+  void Restart();
 
   void ContinueWithRegistration(
       ServiceWorkerStatusCode status,
       const scoped_refptr<ServiceWorkerRegistration>& registration);
   void ContinueWithUpdate(
       ServiceWorkerStatusCode status,
       const scoped_refptr<ServiceWorkerRegistration>& registration);
   void RegisterAndContinue();
   void ContinueWithUninstallingRegistration(
       const scoped_refptr<ServiceWorkerRegistration>& existing_registration,
@@ skipping 36 matching lines @@
   const GURL script_url_;
   std::vector<RegistrationCallback> callbacks_;
   Phase phase_;
   Internal internal_;
   bool doom_installing_worker_;
   bool is_promise_resolved_;
   bool should_uninstall_on_failure_;
   ServiceWorkerStatusCode promise_resolved_status_;
   std::string promise_resolved_status_message_;
   scoped_refptr<ServiceWorkerRegistration> promise_resolved_registration_;
+  base::OneShotTimer<ServiceWorkerRegisterJob> delayed_start_timer_;
   base::WeakPtrFactory<ServiceWorkerRegisterJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerRegisterJob);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_REGISTER_JOB_H_