service worker: Plumb NavigationPreloadManager.enable/disable to browser-side

content/browser/service_worker/service_worker_registration.cc

Index: content/browser/service_worker/service_worker_registration.cc
diff --git a/content/browser/service_worker/service_worker_registration.cc b/content/browser/service_worker/service_worker_registration.cc
index 9efb7098bc6592fda893208fa8335a0dd7cabfa0..92e3051d758ccc6e7343884db08f8c3920ba3d48 100644
--- a/content/browser/service_worker/service_worker_registration.cc
+++ b/content/browser/service_worker/service_worker_registration.cc
@@ -38,6 +38,7 @@ ServiceWorkerRegistration::ServiceWorkerRegistration(
       is_uninstalling_(false),
       is_uninstalled_(false),
       should_activate_when_ready_(false),
+      is_navigation_preload_enabled_(false),
       resources_total_size_bytes_(0),
       context_(context),
       task_runner_(base::ThreadTaskRunnerHandle::Get()) {
@@ -394,6 +395,11 @@ void ServiceWorkerRegistration::SetTaskRunnerForTest(
   task_runner_ = task_runner;
 }
 
+void ServiceWorkerRegistration::EnableNavigationPreload(bool enable) {
+  // TODO(falken): Propagate to current versions and new versions.
+  is_navigation_preload_enabled_ = enable;
+}
+
 void ServiceWorkerRegistration::RegisterRegistrationFinishedCallback(
     const base::Closure& callback) {
   // This should only be called if the registration is in progress.