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

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/interfaces-idls.js

 var idls = {};
 idls.untested = `
 [Exposed=Worker]
 interface WorkerGlobalScope {};
 
 [TreatNonObjectAsNull]
 callback EventHandlerNonNull = any (Event event);
 typedef EventHandlerNonNull? EventHandler;
 
 [NoInterfaceObject, Exposed=(Window,Worker)]
@@ skipping 58 matching lines @@
 ServiceWorker implements AbstractWorker;
 
 enum ServiceWorkerState {
   "installing",
   "installed",
   "activating",
   "activated",
   "redundant"
 };
 
+enum ServiceWorkerUpdateViaCache {
+    "imports",
+    "all",
+    "none"
+};
+
 [SecureContext, Exposed=(Window,Worker)]
 interface ServiceWorkerRegistration : EventTarget {
   readonly attribute ServiceWorker? installing;
   readonly attribute ServiceWorker? waiting;
   readonly attribute ServiceWorker? active;
   [SameObject] readonly attribute NavigationPreloadManager navigationPreload;
 
   readonly attribute USVString scope;
   readonly attribute ServiceWorkerUpdateViaCache updateViaCache;
 
@@ skipping 32 matching lines @@
 
 [SecureContext, Exposed=(Window,Worker)]
 interface CacheStorage {
   [NewObject] Promise<any> match(RequestInfo request, optional CacheQueryOptions options);
   [NewObject] Promise<boolean> has(DOMString cacheName);
   [NewObject] Promise<Cache> open(DOMString cacheName);
   [NewObject] Promise<boolean> delete(DOMString cacheName);
   [NewObject] Promise<sequence<DOMString>> keys();
 };
 `;