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

content/child/service_worker/web_service_worker_registration_impl.cc

Index: content/child/service_worker/web_service_worker_registration_impl.cc
diff --git a/content/child/service_worker/web_service_worker_registration_impl.cc b/content/child/service_worker/web_service_worker_registration_impl.cc
index 6a6d0a59cb68f13722c1c93f39be978f68567512..fc24554dd9dee61b75c2ffec6f7c98866178f28d 100644
--- a/content/child/service_worker/web_service_worker_registration_impl.cc
+++ b/content/child/service_worker/web_service_worker_registration_impl.cc
@@ -123,6 +123,11 @@ blink::WebURL WebServiceWorkerRegistrationImpl::Scope() const {
   return handle_ref_->scope();
 }
 
+blink::WebServiceWorkerUpdateViaCache
+WebServiceWorkerRegistrationImpl::UpdateViaCache() const {
+  return handle_ref_->update_via_cache();
+}
+
 void WebServiceWorkerRegistrationImpl::Update(
     blink::WebServiceWorkerProvider* provider,
     std::unique_ptr<WebServiceWorkerUpdateCallbacks> callbacks) {