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

content/browser/service_worker/service_worker_database.proto

Index: content/browser/service_worker/service_worker_database.proto
diff --git a/content/browser/service_worker/service_worker_database.proto b/content/browser/service_worker/service_worker_database.proto
index 892001d00c0b94865b7c3f068984b62b5365fbe2..6009a1133ec9de6c67b2c80a1b76fc08cfb13e30 100644
--- a/content/browser/service_worker/service_worker_database.proto
+++ b/content/browser/service_worker/service_worker_database.proto
@@ -23,6 +23,12 @@ message ServiceWorkerNavigationPreloadState {
 }
 
 message ServiceWorkerRegistrationData {
+  enum ServiceWorkerUpdateViaCacheType {
+    IMPORTS = 1;
+    ALL = 2;
+    NONE = 3;
+  }
+
   required int64 registration_id = 1;
   required string scope_url = 2;
   required string script_url = 3;
@@ -54,6 +60,9 @@ message ServiceWorkerRegistrationData {
   // The set of features that the worker used up until the time installation
   // completed. The values must be from blink::UseCounter::Feature enum.
   repeated uint32 used_features = 13;
+
+  optional ServiceWorkerUpdateViaCacheType update_via_cache = 14
+      [default = IMPORTS];
 }
 
 message ServiceWorkerResourceRecord {