Implement updateViaCache flag and no-cache by default for main service worker scripts

content/browser/service_worker/service_worker_database.cc

Index: content/browser/service_worker/service_worker_database.cc
diff --git a/content/browser/service_worker/service_worker_database.cc b/content/browser/service_worker/service_worker_database.cc
index 21c002e1390467db240ee82ab797df5c3f39b025..d8913f280b4dad56bab3497a08e373dbe9a05073 100644
--- a/content/browser/service_worker/service_worker_database.cc
+++ b/content/browser/service_worker/service_worker_database.cc
@@ -276,11 +276,11 @@ const char* ServiceWorkerDatabase::StatusToString(
 
 ServiceWorkerDatabase::RegistrationData::RegistrationData()
     : registration_id(kInvalidServiceWorkerRegistrationId),
+      update_via_cache(blink::WebServiceWorkerUpdateViaCache::kImports),
       version_id(kInvalidServiceWorkerVersionId),
       is_active(false),
       has_fetch_handler(false),
-      resources_total_size_bytes(0) {
-}
+      resources_total_size_bytes(0) {}
 
 ServiceWorkerDatabase::RegistrationData::RegistrationData(
     const RegistrationData& other) = default;
@@ -1402,6 +1402,17 @@ ServiceWorkerDatabase::Status ServiceWorkerDatabase::ParseRegistrationData(
   for (uint32_t feature : data.used_features())
     out->used_features.insert(feature);
 
+  if (data.has_update_via_cache()) {
+    auto value = data.update_via_cache();
+    if (ServiceWorkerRegistrationData_ServiceWorkerUpdateViaCacheType_IsValid(
+            value)) {
+      DLOG(ERROR) << "Update via cache mode  '" << value << "' is not valid.";
+      return ServiceWorkerDatabase::STATUS_ERROR_CORRUPTED;
+    }
+    out->update_via_cache =
+        static_cast<blink::WebServiceWorkerUpdateViaCache>(value);
+  }
+
   return ServiceWorkerDatabase::STATUS_OK;
 }
 
@@ -1451,6 +1462,11 @@ void ServiceWorkerDatabase::WriteRegistrationDataInBatch(
   for (uint32_t feature : registration.used_features)
     data.add_used_features(feature);
 
+  data.set_update_via_cache(
+      static_cast<
+          ServiceWorkerRegistrationData_ServiceWorkerUpdateViaCacheType>(
+          registration.update_via_cache));
+
   std::string value;
   bool success = data.SerializeToString(&value);
   DCHECK(success);