service worker: Add NavigationPreload runtime flag and skeleton interface

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

Index: third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.cpp
diff --git a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.cpp b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.cpp
index 34c926f1e8219f03faba6e375cf43e123c3a645e..51dae1303c9b5897e26e6a68191b38368ef37030 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.cpp
+++ b/third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.cpp
@@ -36,6 +36,7 @@
 #include "core/events/Event.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "modules/EventTargetModules.h"
+#include "modules/serviceworkers/NavigationPreloadOptions.h"
 #include "modules/serviceworkers/ServiceWorkerContainerClient.h"
 #include "public/platform/WebMessagePortChannel.h"
 #include "public/platform/WebSecurityOrigin.h"
@@ -122,6 +123,18 @@ String ServiceWorker::state() const {
   }
 }
 
+ScriptPromise ServiceWorker::getNavigationPreload(ScriptState* scriptState) {
+  NOTIMPLEMENTED();
+  return ScriptPromise();
+}
+
+ScriptPromise ServiceWorker::setNavigationPreload(
+    ScriptState* scriptState,
+    const NavigationPreloadOptions& options) {
+  NOTIMPLEMENTED();
+  return ScriptPromise();
+}
+
 ServiceWorker* ServiceWorker::from(
     ExecutionContext* executionContext,
     std::unique_ptr<WebServiceWorker::Handle> handle) {