service worker: Add promise boilerplate for NavigationPreload enable/disable

third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerRegistration.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebServiceWorkerRegistration_h
 #define WebServiceWorkerRegistration_h
 
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/WebURL.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerError.h"
 
 namespace blink {
 
 class WebServiceWorkerProvider;
 class WebServiceWorkerRegistrationProxy;
 
 // The interface of the registration representation in the embedder. The
 // embedder implements this interface and passes its handle
 // (WebServiceWorkerRegistration::Handle) to Blink. Blink accesses the
 // implementation via the handle to update or unregister the registration.
 class WebServiceWorkerRegistration {
  public:
   virtual ~WebServiceWorkerRegistration() {}
 
   using WebServiceWorkerUpdateCallbacks =
       WebCallbacks<void, const WebServiceWorkerError&>;
   using WebServiceWorkerUnregistrationCallbacks =
       WebCallbacks<bool, const WebServiceWorkerError&>;
+  using WebEnableNavigationPreloadCallbacks =
+      WebCallbacks<void, const WebServiceWorkerError&>;
+  using WebDisableNavigationPreloadCallbacks =
+      WebCallbacks<void, const WebServiceWorkerError&>;
 
   // The handle interface that retains a reference to the implementation of
   // WebServiceWorkerRegistration in the embedder and is owned by
   // ServiceWorkerRegistration object in Blink. The embedder must keep the
   // registration representation while Blink is owning this handle.
   class Handle {
    public:
     virtual ~Handle() {}
     virtual WebServiceWorkerRegistration* registration() { return nullptr; }
   };
 
   virtual void setProxy(WebServiceWorkerRegistrationProxy*) {}
   virtual WebServiceWorkerRegistrationProxy* proxy() { return nullptr; }
   virtual void proxyStopped() {}
 
   virtual WebURL scope() const { return WebURL(); }
   virtual void update(WebServiceWorkerProvider*,
                       WebServiceWorkerUpdateCallbacks*) {}
   virtual void unregister(WebServiceWorkerProvider*,
                           WebServiceWorkerUnregistrationCallbacks*) {}
+
+  virtual void enableNavigationPreload(WebEnableNavigationPreloadCallbacks*) {}
+  virtual void disableNavigationPreload(WebEnableNavigationPreloadCallbacks*) {}
 };
 
 }  // namespace blink
 
 #endif  // WebServiceWorkerRegistration_h