service worker: navigation preload basic setters/getters and flag

third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl

Index: third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl
diff --git a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl
index 8c556979c8b199f9e2133758c117b31b01a1c433..d93a2a82af50104f8f5cccdb691de1694562e6f5 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl
+++ b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.idl
@@ -44,11 +44,13 @@ enum ServiceWorkerState {
 ] interface ServiceWorker : EventTarget {
 
     [PostMessage, RaisesException] void postMessage(SerializedScriptValue message, optional sequence<Transferable> transfer);
-
     readonly attribute USVString scriptURL;
     readonly attribute ServiceWorkerState  state;
 
     attribute EventHandler onstatechange;
+
+    [CallWith=ScriptState,RuntimeEnabled=ServiceWorkerNavigationPreload] Promise<void> setNavigationPreload(NavigationPreloadOptions options);
+    [CallWith=ScriptState,RuntimeEnabled=ServiceWorkerNavigationPreload] Promise<Dictionary> getNavigationPreload();
 };
 
 ServiceWorker implements AbstractWorker;