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..3a38eb09737cac14c46f93c74f06f19dafdeb00a 100644
--- a/content/browser/service_worker/service_worker_register_job.cc
+++ b/content/browser/service_worker/service_worker_register_job.cc
@@ -7,12 +7,14 @@
 #include <vector>
 
 #include "base/message_loop/message_loop.h"
+#include "base/rand_util.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_job_coordinator.h"
 #include "content/browser/service_worker/service_worker_registration.h"
 #include "content/browser/service_worker/service_worker_storage.h"
 #include "content/browser/service_worker/service_worker_utils.h"
 #include "content/common/service_worker/service_worker_types.h"
+#include "content/public/browser/browser_main_runner.h"
 #include "net/base/net_errors.h"
 
 namespace content {
@@ -81,6 +83,16 @@ void ServiceWorkerRegisterJob::AddCallback(
 
 void ServiceWorkerRegisterJob::Start() {
   SetPhase(START);
+
+  if (IsBrowserStartingUp()) {
+    // Delay running update jobs until after startup.
+    delayed_start_timer_.Start(
+        FROM_HERE, base::TimeDelta::FromSeconds(base::RandInt(5, 15)),
+        base::Bind(&ServiceWorkerRegisterJob::Restart,
+                   weak_factory_.GetWeakPtr()));
+    return;
+  }
+
   ServiceWorkerStorage::FindRegistrationCallback next_step;
   if (job_type_ == REGISTRATION_JOB) {
     next_step = base::Bind(
@@ -178,11 +190,18 @@ void ServiceWorkerRegisterJob::SetPhase(Phase phase) {
       DCHECK(phase_ != INITIAL && phase_ != COMPLETE) << phase_;
       break;
     case ABORT:
+      delayed_start_timer_.Stop();
       break;
   }
   phase_ = phase;
 }
 
+void ServiceWorkerRegisterJob::Restart() {
+  DCHECK(phase_ == START) << phase_;

[cmumford, 2015/02/26 23:47:45]

DCHECK_EQ.

Also, couldn't you get here before START if startup was slow?

+  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.