Implement a Mojo service for Background Fetch

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchManager.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 BackgroundFetchManager_h
 #define BackgroundFetchManager_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/GarbageCollected.h"
 #include "platform/heap/Handle.h"
+#include "public/platform/modules/background_fetch/background_fetch.mojom-blink.h"
 
 namespace blink {
 
+class BackgroundFetchBridge;
 class BackgroundFetchOptions;
+class BackgroundFetchRegistration;
 class RequestOrUSVStringOrRequestOrUSVStringSequence;
+class ScriptPromiseResolver;
 class ScriptState;
 class ServiceWorkerRegistration;
 
 // Implementation of the BackgroundFetchManager JavaScript object, accessible
 // by developers through ServiceWorkerRegistration.backgroundFetch.
 class BackgroundFetchManager final
     : public GarbageCollected<BackgroundFetchManager>,
       public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static BackgroundFetchManager* create(
       ServiceWorkerRegistration* registration) {
     return new BackgroundFetchManager(registration);
   }
 
   // Web Exposed methods defined in the IDL file.
   ScriptPromise fetch(
       ScriptState*,
-      String tag,
+      const String& tag,
       const RequestOrUSVStringOrRequestOrUSVStringSequence& requests,
       const BackgroundFetchOptions&);
-  ScriptPromise get(ScriptState*, String tag);
+  ScriptPromise get(ScriptState*, const String& tag);
   ScriptPromise getTags(ScriptState*);
 
   DECLARE_TRACE();
 
  private:
   explicit BackgroundFetchManager(ServiceWorkerRegistration*);
 
+  void didGetRegistration(ScriptPromiseResolver*,
+                          mojom::blink::BackgroundFetchError,
+                          BackgroundFetchRegistration*);
+  void didGetTags(ScriptPromiseResolver*,
+                  mojom::blink::BackgroundFetchError,
+                  const Vector<String>& tags);
+
   Member<ServiceWorkerRegistration> m_registration;
+  Member<BackgroundFetchBridge> m_bridge;
 };
 
 }  // namespace blink
 
 #endif  // BackgroundFetchManager_h