service worker: Implement NavigationPreloadManager.getState

third_party/WebKit/Source/modules/serviceworkers/NavigationPreloadCallbacks.h

 // Copyright 2016 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 NavigationPreloadCallbacks_h
 #define NavigationPreloadCallbacks_h
 
 #include "public/platform/modules/serviceworker/WebServiceWorkerRegistration.h"
 
 namespace blink {
 
 class ScriptPromiseResolver;
+struct WebNavigationPreloadState;
 struct WebServiceWorkerError;
 
 class EnableNavigationPreloadCallbacks final
     : public WebServiceWorkerRegistration::WebEnableNavigationPreloadCallbacks {
  public:
   EnableNavigationPreloadCallbacks(ScriptPromiseResolver*);
   ~EnableNavigationPreloadCallbacks() override;
 
   // WebEnableNavigationPreloadCallbacks interface.
   void onSuccess() override;
   void onError(const WebServiceWorkerError&) override;
 
  private:
   Persistent<ScriptPromiseResolver> m_resolver;
   WTF_MAKE_NONCOPYABLE(EnableNavigationPreloadCallbacks);
 };
 
+class GetNavigationPreloadStateCallbacks final
+    : public WebServiceWorkerRegistration::
+          WebGetNavigationPreloadStateCallbacks {
+ public:
+  GetNavigationPreloadStateCallbacks(ScriptPromiseResolver*);
+  ~GetNavigationPreloadStateCallbacks() override;
+
+  // WebGetNavigationPreloadStateCallbacks interface.
+  void onSuccess(const WebNavigationPreloadState&) override;
+  void onError(const WebServiceWorkerError&) override;
+
+ private:
+  Persistent<ScriptPromiseResolver> m_resolver;
+  WTF_MAKE_NONCOPYABLE(GetNavigationPreloadStateCallbacks);
+};
+
 }  // namespace blink
 
 #endif  // NavigationPreloadCallbacks_h