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

content/common/service_worker/service_worker_types.cc

Index: content/common/service_worker/service_worker_types.cc
diff --git a/content/common/service_worker/service_worker_types.cc b/content/common/service_worker/service_worker_types.cc
index 4ebe7bdbda619b552247e55d752244e7bdfa4de4..6ef280d538a2beeb55c00b002b59eb8414d25639 100644
--- a/content/common/service_worker/service_worker_types.cc
+++ b/content/common/service_worker/service_worker_types.cc
@@ -132,10 +132,23 @@ bool ServiceWorkerObjectInfo::IsValid() const {
          version_id != kInvalidServiceWorkerVersionId;
 }
 
+ServiceWorkerRegistrationOptions::ServiceWorkerRegistrationOptions()
+    : update_via_cache(blink::WebServiceWorkerUpdateViaCache::kImports) {}
+
+ServiceWorkerRegistrationOptions::ServiceWorkerRegistrationOptions(
+    const GURL& scope)
+    : ServiceWorkerRegistrationOptions(
+          scope,
+          blink::WebServiceWorkerUpdateViaCache::kImports) {}
+
+ServiceWorkerRegistrationOptions::ServiceWorkerRegistrationOptions(
+    const GURL& scope,
+    blink::WebServiceWorkerUpdateViaCache update_via_cache)
+    : scope(scope), update_via_cache(update_via_cache) {}
+
 ServiceWorkerRegistrationObjectInfo::ServiceWorkerRegistrationObjectInfo()
     : handle_id(kInvalidServiceWorkerRegistrationHandleId),
-      registration_id(kInvalidServiceWorkerRegistrationId) {
-}
+      registration_id(kInvalidServiceWorkerRegistrationId) {}
 
 ServiceWorkerClientQueryOptions::ServiceWorkerClientQueryOptions()
     : client_type(blink::kWebServiceWorkerClientTypeWindow),