service worker: Persist NavigationPreloadState

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 6bb84561f146cbe08dafdd555475e13645f7eda1..3ae7551f30a2337597569d228641383008844b84 100644
--- a/content/browser/service_worker/service_worker_database.proto
+++ b/content/browser/service_worker/service_worker_database.proto
@@ -17,6 +17,11 @@ message ServiceWorkerOriginTrialInfo {
   repeated ServiceWorkerOriginTrialFeature features = 1;
 }
 
+message ServiceWorkerNavigationPreloadState {
+  required bool enabled = 1;
+  optional string header = 2;
+}
+
 message ServiceWorkerRegistrationData {
   required int64 registration_id = 1;
   required string scope_url = 2;
@@ -43,6 +48,8 @@ message ServiceWorkerRegistrationData {
   // Service Worker and load the main script resource in ServiceWorkerStorage
   // to check the HTTP header.
   optional ServiceWorkerOriginTrialInfo origin_trial_tokens = 11;
+
+  optional ServiceWorkerNavigationPreloadState navigation_preload_state = 12;
 }
 
 message ServiceWorkerResourceRecord {