Implement a Mojo service for Background Fetch

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchedEvent.h

 // Copyright 2017 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 BackgroundFetchedEvent_h
 #define BackgroundFetchedEvent_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "modules/background_fetch/BackgroundFetchEvent.h"
 #include "platform/heap/Handle.h"
+#include "public/platform/modules/background_fetch/background_fetch.mojom-blink.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class BackgroundFetchSettledRequest;
 class BackgroundFetchedEventInit;
+class ServiceWorkerRegistration;
 
 class BackgroundFetchedEvent final : public BackgroundFetchEvent {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static BackgroundFetchedEvent* create(
       const AtomicString& type,
       const BackgroundFetchedEventInit& initializer) {
-    return new BackgroundFetchedEvent(type, initializer);
+    return new BackgroundFetchedEvent(type, initializer,
+                                      nullptr /* registration */);
+  }
+
+  static BackgroundFetchedEvent* create(
+      const AtomicString& type,
+      const BackgroundFetchedEventInit& initializer,
+      ServiceWorkerRegistration* registration) {
+    return new BackgroundFetchedEvent(type, initializer, registration);
   }
 
   ~BackgroundFetchedEvent() override;
 
   // Web Exposed attribute defined in the IDL file.
   HeapVector<Member<BackgroundFetchSettledRequest>> completedFetches() const;
 
   // Web Exposed method defined in the IDL file.
-  ScriptPromise updateUI(ScriptState*, String title);
+  ScriptPromise updateUI(ScriptState*, const String& title);
 
   // ExtendableEvent interface.
   const AtomicString& interfaceName() const override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   BackgroundFetchedEvent(const AtomicString& type,
-                         const BackgroundFetchedEventInit&);
+                         const BackgroundFetchedEventInit&,
+                         ServiceWorkerRegistration*);
+
+  void didUpdateUI(ScriptPromiseResolver*, mojom::blink::BackgroundFetchError);
 
   HeapVector<Member<BackgroundFetchSettledRequest>> m_completedFetches;
+  Member<ServiceWorkerRegistration> m_registration;
 };
 
 }  // namespace blink
 
 #endif  // BackgroundFetchedEvent_h