Introduce Origin-Trial for Service Worker Navigation Preload

content/browser/service_worker/service_worker_dispatcher_host.cc

Index: content/browser/service_worker/service_worker_dispatcher_host.cc
diff --git a/content/browser/service_worker/service_worker_dispatcher_host.cc b/content/browser/service_worker/service_worker_dispatcher_host.cc
index c0e32cee57284480dc9383c33efd166ab64c10c8..2275ea32268c7cee1888183c385ce7b2e1714739 100644
--- a/content/browser/service_worker/service_worker_dispatcher_host.cc
+++ b/content/browser/service_worker/service_worker_dispatcher_host.cc
@@ -81,6 +81,27 @@ WebContents* GetWebContents(int render_process_id, int render_frame_id) {
   return WebContents::FromRenderFrameHost(rfh);
 }
 
+std::string GetNavigationPreloadDisabledErrorMessage(
+    ServiceWorkerVersion::NavigationPreloadSupportStatus support_status) {
+  switch (support_status) {
+    case ServiceWorkerVersion::NavigationPreloadSupportStatus::SUPPORTED:
+      NOTREACHED();
+      break;
+    case ServiceWorkerVersion::NavigationPreloadSupportStatus::
+        NOT_SUPPORTED_FIELD_TRIAL_STOPPED:
+      return "The Navigation Preload Origin Trial has ended.";
+    case ServiceWorkerVersion::NavigationPreloadSupportStatus::
+        NOT_SUPPORTED_DISABLED_BY_COMMAND_LINE:
+      return "Navigation Preload is disabled by command line flag.";
+    case ServiceWorkerVersion::NavigationPreloadSupportStatus::
+        NOT_SUPPORTED_NO_VALID_ORIGIN_TRIAL_TOKEN:
+      return "The service worker script does not have a valid Navigation "
+             "Preload Origin Trial token.";
+  }
+  NOTREACHED();
+  return "";
+}
+
 }  // namespace
 
 ServiceWorkerDispatcherHost::ServiceWorkerDispatcherHost(
@@ -717,6 +738,17 @@ void ServiceWorkerDispatcherHost::OnEnableNavigationPreload(
     return;
   }
 
+  ServiceWorkerVersion::NavigationPreloadSupportStatus support_status =
+      registration->active_version()->GetNavigationPreloadSupportStatus();
+  if (support_status !=
+      ServiceWorkerVersion::NavigationPreloadSupportStatus::SUPPORTED) {
+    Send(new ServiceWorkerMsg_EnableNavigationPreloadError(
+        thread_id, request_id, WebServiceWorkerError::ErrorTypeAbort,
+        std::string(kEnableNavigationPreloadErrorPrefix) +
+            GetNavigationPreloadDisabledErrorMessage(support_status)));
+    return;
+  }
+
   std::vector<GURL> urls = {provider_host->document_url(),
                             registration->pattern()};
   if (!ServiceWorkerUtils::AllOriginsMatchAndCanAccessServiceWorkers(urls)) {
@@ -859,6 +891,16 @@ void ServiceWorkerDispatcherHost::OnSetNavigationPreloadHeader(
     return;
   }
 
+  ServiceWorkerVersion::NavigationPreloadSupportStatus support_status =
+      registration->active_version()->GetNavigationPreloadSupportStatus();
+  if (support_status !=
+      ServiceWorkerVersion::NavigationPreloadSupportStatus::SUPPORTED) {
+    Send(new ServiceWorkerMsg_SetNavigationPreloadHeaderError(
+        thread_id, request_id, WebServiceWorkerError::ErrorTypeAbort,
+        std::string(kSetNavigationPreloadHeaderErrorPrefix) +
+            GetNavigationPreloadDisabledErrorMessage(support_status)));
+    return;
+  }
   std::vector<GURL> urls = {provider_host->document_url(),
                             registration->pattern()};
   if (!ServiceWorkerUtils::AllOriginsMatchAndCanAccessServiceWorkers(urls)) {