Implement the BackgroundFetch{Fail,ed} Service Worker events

third_party/WebKit/Source/modules/serviceworkers/WaitUntilObserver.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 WaitUntilObserver_h
 #define WaitUntilObserver_h
 
 #include "modules/ModulesExport.h"
 #include "modules/serviceworkers/ServiceWorkerGlobalScopeClient.h"
 #include "platform/Timer.h"
@@ skipping 15 matching lines @@
     Activate,
     Fetch,
     Install,
     Message,
     NotificationClick,
     NotificationClose,
     PaymentRequest,
     Push,
     Sync,
     BackgroundFetchAbort,
-    BackgroundFetchClick
+    BackgroundFetchClick,
+    BackgroundFetchFail,
+    BackgroundFetched
   };
 
   static WaitUntilObserver* create(ExecutionContext*, EventType, int eventID);
 
   // Must be called before and after dispatching the event.
   void willDispatchEvent();
   void didDispatchEvent(bool errorOccurred);
 
   // Observes the promise and delays calling the continuation until
   // the given promise is resolved or rejected.
@@ skipping 25 matching lines @@
   int m_pendingActivity = 0;
   bool m_hasError = false;
   bool m_eventDispatched = false;
   double m_eventDispatchTime = 0;
   TaskRunnerTimer<WaitUntilObserver> m_consumeWindowInteractionTimer;
 };
 
 }  // namespace blink
 
 #endif  // WaitUntilObserver_h