Prefetching: Introduce store commands abstractions to be used by tasks.

components/offline_pages/core/prefetch/prefetch_service.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 COMPONENTS_OFFLINE_PAGES_CORE_PREFETCH_PREFETCH_SERVICE_H_
 #define COMPONENTS_OFFLINE_PAGES_CORE_PREFETCH_PREFETCH_SERVICE_H_
 
 #include "components/keyed_service/core/keyed_service.h"
 
 namespace offline_pages {
 class OfflineEventLogger;
 class OfflineMetricsCollector;
 class PrefetchDispatcher;
 class PrefetchGCMHandler;
-class PrefetchStore;
+class PrefetchStoreCommandFactory;
 class SuggestedArticlesObserver;
 
 // Main class and entry point for the Offline Pages Prefetching feature, that
 // controls the lifetime of all major subcomponents of the prefetching system.
 class PrefetchService : public KeyedService {
  public:
   ~PrefetchService() override = default;
 
   // Subobjects that are created and owned by this service. Creation should be
   // lightweight, all heavy work must be done on-demand only.
   // The service manages lifetime, hookup and initialization of Prefetch
   // system that consists of multiple specialized objects, all vended by this
   // service.
+  virtual OfflineEventLogger* GetLogger() = 0;
   virtual OfflineMetricsCollector* GetOfflineMetricsCollector() = 0;
   virtual PrefetchDispatcher* GetPrefetchDispatcher() = 0;
   virtual PrefetchGCMHandler* GetPrefetchGCMHandler() = 0;
-  virtual PrefetchStore* GetPrefetchStore() = 0;
-  virtual OfflineEventLogger* GetLogger() = 0;
+  virtual PrefetchStoreCommandFactory* GetPrefetchStoreCommandFactory() = 0;
 
   // May be |nullptr| in tests.  The PrefetchService does not depend on the
   // SuggestedArticlesObserver, it merely owns it for lifetime purposes.
   virtual SuggestedArticlesObserver* GetSuggestedArticlesObserver() = 0;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_CORE_PREFETCH_PREFETCH_SERVICE_H_