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

components/offline_pages/core/prefetch/prefetch_service_impl.cc

Index: components/offline_pages/core/prefetch/prefetch_service_impl.cc
diff --git a/components/offline_pages/core/prefetch/prefetch_service_impl.cc b/components/offline_pages/core/prefetch/prefetch_service_impl.cc
index 11d1d6fa888055dd9af5402a74c87ba69585d1bc..0f17983821896ca41bf0fdb14fcac183117eb4b2 100644
--- a/components/offline_pages/core/prefetch/prefetch_service_impl.cc
+++ b/components/offline_pages/core/prefetch/prefetch_service_impl.cc
@@ -10,8 +10,9 @@
 #include "base/memory/ptr_util.h"
 #include "components/offline_pages/core/prefetch/offline_metrics_collector.h"
 #include "components/offline_pages/core/prefetch/prefetch_dispatcher.h"
+#include "components/offline_pages/core/prefetch/prefetch_dispatcher_impl.h"
 #include "components/offline_pages/core/prefetch/prefetch_gcm_handler.h"
-#include "components/offline_pages/core/prefetch/prefetch_store.h"
+#include "components/offline_pages/core/prefetch/store/prefetch_store_command_factory.h"
 #include "components/offline_pages/core/prefetch/suggested_articles_observer.h"
 
 namespace offline_pages {
@@ -20,12 +21,12 @@ PrefetchServiceImpl::PrefetchServiceImpl(
     std::unique_ptr<OfflineMetricsCollector> offline_metrics_collector,
     std::unique_ptr<PrefetchDispatcher> dispatcher,
     std::unique_ptr<PrefetchGCMHandler> gcm_handler,
-    std::unique_ptr<PrefetchStore> store,
+    std::unique_ptr<PrefetchStoreCommandFactory> store_command_factory,
     std::unique_ptr<SuggestedArticlesObserver> suggested_articles_observer)
     : offline_metrics_collector_(std::move(offline_metrics_collector)),
       prefetch_dispatcher_(std::move(dispatcher)),
       prefetch_gcm_handler_(std::move(gcm_handler)),
-      prefetch_store_(std::move(store)),
+      store_command_factory_(std::move(store_command_factory)),
       suggested_articles_observer_(std::move(suggested_articles_observer)) {
   prefetch_dispatcher_->SetService(this);
   prefetch_gcm_handler_->SetService(this);
@@ -45,8 +46,9 @@ PrefetchGCMHandler* PrefetchServiceImpl::GetPrefetchGCMHandler() {
   return prefetch_gcm_handler_.get();
 }
 
-PrefetchStore* PrefetchServiceImpl::GetPrefetchStore() {
-  return prefetch_store_.get();
+PrefetchStoreCommandFactory*
+PrefetchServiceImpl::GetPrefetchStoreCommandFactory() {
+  return store_command_factory_.get();
 }
 
 SuggestedArticlesObserver* PrefetchServiceImpl::GetSuggestedArticlesObserver() {