Implement a poor man's PostAfterStartupTask() function.

content/browser/service_worker/service_worker_register_job.cc

Index: content/browser/service_worker/service_worker_register_job.cc
diff --git a/content/browser/service_worker/service_worker_register_job.cc b/content/browser/service_worker/service_worker_register_job.cc
index 0a28dc1ccab0af6b23f99e53b9b04f4f851599e6..6c4f7d0b95277e96dc54023def42bd7f55d4f25d 100644
--- a/content/browser/service_worker/service_worker_register_job.cc
+++ b/content/browser/service_worker/service_worker_register_job.cc
@@ -81,6 +81,17 @@ void ServiceWorkerRegisterJob::AddCallback(
 
 void ServiceWorkerRegisterJob::Start() {
   SetPhase(START);
+
+  if (IsBrowserStartingUp()) {
+    // Delay running update jobs until after startup.
+    const base::TimeDelta kRetryInterval = base::TimeDelta::FromSeconds(15);
+    delayed_start_timer_.Start(
+        FROM_HERE, kRetryInterval,
+        base::Bind(&ServiceWorkerRegisterJob::Restart,
+                   weak_factory_.GetWeakPtr()));
+    return;
+  }
+
   ServiceWorkerStorage::FindRegistrationCallback next_step;
   if (job_type_ == REGISTRATION_JOB) {
     next_step = base::Bind(
@@ -183,6 +194,12 @@ void ServiceWorkerRegisterJob::SetPhase(Phase phase) {
   phase_ = phase;
 }
 
+void ServiceWorkerRegisterJob::Restart() {
+  DCHECK(phase_ == START) << phase_;
+  phase_ = INITIAL;
+  Start();
+}
+
 // This function corresponds to the steps in [[Register]] following
 // "Let registration be the result of running the [[GetRegistration]] algorithm.
 // Throughout this file, comments in quotes are excerpts from the spec.