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

content/browser/service_worker/service_worker_registration.h

Index: content/browser/service_worker/service_worker_registration.h
diff --git a/content/browser/service_worker/service_worker_registration.h b/content/browser/service_worker/service_worker_registration.h
index e78d181f5218915b0a2fa57d816570cc1c003a64..c5d9a05a1be7e87b239cecb67ea703e21a1ba329 100644
--- a/content/browser/service_worker/service_worker_registration.h
+++ b/content/browser/service_worker/service_worker_registration.h
@@ -56,6 +56,9 @@ class CONTENT_EXPORT ServiceWorkerRegistration
 
   int64_t id() const { return registration_id_; }
   const GURL& pattern() const { return pattern_; }
+  blink::WebServiceWorkerUpdateViaCache update_via_cache() const {
+    return update_via_cache_;
+  }
 
   bool is_deleted() const { return is_deleted_; }
   void set_is_deleted(bool deleted) { is_deleted_ = deleted; }
@@ -198,6 +201,7 @@ class CONTENT_EXPORT ServiceWorkerRegistration
                          ServiceWorkerStatusCode status);
 
   const GURL pattern_;
+  const blink::WebServiceWorkerUpdateViaCache update_via_cache_;
   const int64_t registration_id_;
   bool is_deleted_;
   bool is_uninstalling_;