After 24 hours, bust the browser cache when checking for ServiceWorker updates

content/browser/service_worker/service_worker_storage.cc

Index: content/browser/service_worker/service_worker_storage.cc
diff --git a/content/browser/service_worker/service_worker_storage.cc b/content/browser/service_worker/service_worker_storage.cc
index f09127ee81457e61b4101b0c53a124e7d3b2fda7..7b9b510dbd05ac4401239f82a50366c9d9dcc156 100644
--- a/content/browser/service_worker/service_worker_storage.cc
+++ b/content/browser/service_worker/service_worker_storage.cc
@@ -417,7 +417,7 @@ void ServiceWorkerStorage::StoreRegistration(
   data.script = registration->script_url();
   data.has_fetch_handler = true;
   data.version_id = version->version_id();
-  data.last_update_check = base::Time::Now();
+  data.last_update_check = registration->last_update_check();
   data.is_active = false;  // initially stored in the waiting state
 
   ResourceList resources;
@@ -460,6 +460,24 @@ void ServiceWorkerStorage::UpdateToActiveState(
                  callback));
 }
 
+void ServiceWorkerStorage::UpdateLastUpdateCheckTime(
+    ServiceWorkerRegistration* registration) {
+  DCHECK(registration);
+
+  DCHECK(state_ == INITIALIZED || state_ == DISABLED) << state_;
+  if (IsDisabled() || !context_)
+    return;
+
+  database_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(
+          base::IgnoreResult(&ServiceWorkerDatabase::UpdateLastCheckTime),
+          base::Unretained(database_.get()),
+          registration->id(),
+          registration->script_url().GetOrigin(),
+          registration->last_update_check()));
+}
+
 void ServiceWorkerStorage::DeleteRegistration(
     int64 registration_id,
     const GURL& origin,
@@ -922,6 +940,7 @@ ServiceWorkerStorage::GetOrCreateRegistration(
 
   registration = new ServiceWorkerRegistration(
       data.scope, data.script, data.registration_id, context_);
+  registration->set_last_update_check(data.last_update_check);
   if (pending_deletions_.find(data.registration_id) !=
       pending_deletions_.end()) {
     registration->set_is_deleted();