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

content/browser/service_worker/service_worker_database.h

Index: content/browser/service_worker/service_worker_database.h
diff --git a/content/browser/service_worker/service_worker_database.h b/content/browser/service_worker/service_worker_database.h
index c142203eac63501c077559d1fe08ba96d6dfad69..e3cd447302248d8857705855c0f2099f6c96106a 100644
--- a/content/browser/service_worker/service_worker_database.h
+++ b/content/browser/service_worker/service_worker_database.h
@@ -35,7 +35,7 @@ class DB;
 class Env;
 class Status;
 class WriteBatch;
-}
+}  // namespace leveldb
 
 namespace content {
 
@@ -66,6 +66,7 @@ class CONTENT_EXPORT ServiceWorkerDatabase {
     // These values are immutable for the life of a registration.
     int64_t registration_id;
     GURL scope;
+    blink::WebServiceWorkerUpdateViaCache update_via_cache;
 
     // Versions are first stored once they successfully install and become
     // the waiting version. Then transition to the active version. The stored