Service Worker: Change the criteria for bumping the last update check time

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 244905ef69c213e2d69d80e35acbdb899aa413a2..12f18b79fca8125fe2a90a4511e21d07e2fbf2c1 100644
--- a/content/browser/service_worker/service_worker_register_job.cc
+++ b/content/browser/service_worker/service_worker_register_job.cc
@@ -350,6 +350,17 @@ void ServiceWorkerRegisterJob::UpdateAndContinue() {
 
 void ServiceWorkerRegisterJob::OnStartWorkerFinished(
     ServiceWorkerStatusCode status) {
+  // Bump the last update check time only when the register/update job fetched
+  // the version having bypassed the network cache.

[falken, 2015/12/07 07:40:33]

Please add a comment here about the side effect of BYPASS_CACHE we're relying on
here. BYPASS_CACHE will evict an existing cache entry, so it's ok to bump the
update check time.

[jungkees, 2015/12/15 13:07:45]

Done.

+  if (new_version()->embedded_worker()->network_accessed_for_script() ||
+      new_version()->force_bypass_cache_for_scripts()) {
+    registration()->set_last_update_check(base::Time::Now());
+
+    // Avoid reading disk for first time registrations.

[falken, 2015/12/07 07:40:33]

I think you can just remove this comment. It's clear you don't need to update
storage for a register job since it hasn't been written yet.

[jungkees, 2015/12/15 13:07:45]

Done.

+    if (job_type_ == UPDATE_JOB)
+      context_->storage()->UpdateLastUpdateCheckTime(registration());
+  }
+
   if (status == SERVICE_WORKER_OK) {
     InstallAndContinue();
     return;
@@ -357,16 +368,6 @@ void ServiceWorkerRegisterJob::OnStartWorkerFinished(
 
   // The updated worker is identical to the incumbent.
   if (status == SERVICE_WORKER_ERROR_EXISTS) {
-    // Only bump the last check time when we've bypassed the browser cache.
-    base::TimeDelta time_since_last_check =
-        base::Time::Now() - registration()->last_update_check();
-    if (time_since_last_check > base::TimeDelta::FromHours(
-                                    kServiceWorkerScriptMaxCacheAgeInHours) ||
-        new_version()->force_bypass_cache_for_scripts()) {
-      registration()->set_last_update_check(base::Time::Now());
-      context_->storage()->UpdateLastUpdateCheckTime(registration());
-    }
-
     ResolvePromise(SERVICE_WORKER_OK, std::string(), registration());
     Complete(status, "The updated worker is identical to the incumbent.");
     return;
@@ -431,7 +432,6 @@ void ServiceWorkerRegisterJob::OnInstallFinished(
   }
 
   SetPhase(STORE);
-  registration()->set_last_update_check(base::Time::Now());
   context_->storage()->StoreRegistration(
       registration(),
       new_version(),