service worker: Implement NavigationPreloadManager.setHeaderValue

content/browser/service_worker/service_worker_version.h

Index: content/browser/service_worker/service_worker_version.h
diff --git a/content/browser/service_worker/service_worker_version.h b/content/browser/service_worker/service_worker_version.h
index b77d042b4f68fcd16e6304116eea0155920725d0..d628e08c56d71039d8dc428937dad6a403e6a581 100644
--- a/content/browser/service_worker/service_worker_version.h
+++ b/content/browser/service_worker/service_worker_version.h
@@ -170,17 +170,16 @@ class CONTENT_EXPORT ServiceWorkerVersion
     foreign_fetch_origins_ = origins;
   }
 
-  // Only meaningful if this version is active.
-  bool navigation_preload_enabled() const {
+  // Meaningful only if this version is active.
+  const NavigationPreloadState& navigation_preload_state() const {
     DCHECK(status_ == ACTIVATING || status_ == ACTIVATED) << status_;
-    return navigation_preload_enabled_;
+    return navigation_preload_state_;
   }
   // Only intended for use by ServiceWorkerRegistration. Generally use
-  // ServiceWorkerRegistration::EnableNavigationPreload instead of this
+  // ServiceWorkerRegistration::EnableNavigationPreload or
+  // ServiceWorkerRegistration::SetNavigationPreloadHeader instead of this
   // function.
-  void set_navigation_preload_enabled(bool enabled) {
-    navigation_preload_enabled_ = enabled;
-  }
+  void SetNavigationPreloadState(const NavigationPreloadState& state);
 
   ServiceWorkerMetrics::Site site_for_uma() const { return site_for_uma_; }
 
@@ -736,10 +735,10 @@ class CONTENT_EXPORT ServiceWorkerVersion
   std::vector<url::Origin> foreign_fetch_origins_;
   FetchHandlerExistence fetch_handler_existence_;
   // The source of truth for navigation preload state is the
-  // ServiceWorkerRegistration. |navigation_preload_enabled_| is essentially a
-  // cache for the state because it must be looked up quickly and a live
-  // registration doesn't necessarily exist whenever there is a live version.
-  bool navigation_preload_enabled_ = false;
+  // ServiceWorkerRegistration. |navigation_preload_state_| is essentially a
+  // cached value because it must be looked up quickly and a live registration
+  // doesn't necessarily exist whenever there is a live version.
+  NavigationPreloadState navigation_preload_state_;
   ServiceWorkerMetrics::Site site_for_uma_;
 
   Status status_ = NEW;