[NTP Snippets] Refactor background scheduling for remote suggestions

ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc

Index: ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc
diff --git a/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc b/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc
index b950d475f17d234ac71fca1a378348ab5d420a83..9c16e222ee83a6a7a25ae04183bed098a7767bcc 100644
--- a/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc
+++ b/ios/chrome/browser/ntp_snippets/ios_chrome_content_suggestions_service_factory.cc
@@ -22,9 +22,11 @@
 #include "components/ntp_snippets/features.h"
 #include "components/ntp_snippets/ntp_snippets_constants.h"
 #include "components/ntp_snippets/remote/ntp_snippets_fetcher.h"
+#include "components/ntp_snippets/remote/persistent_scheduler.h"
 #include "components/ntp_snippets/remote/remote_suggestions_database.h"
-#include "components/ntp_snippets/remote/remote_suggestions_provider.h"
+#include "components/ntp_snippets/remote/remote_suggestions_provider_impl.h"
 #include "components/ntp_snippets/remote/remote_suggestions_status_service.h"
+#include "components/ntp_snippets/remote/scheduling_remote_suggestions_provider.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "components/version_info/version_info.h"
 #include "google_apis/google_api_keys.h"
@@ -47,10 +49,11 @@ using ios::BookmarkModelFactory;
 using ntp_snippets::BookmarkSuggestionsProvider;
 using ntp_snippets::ContentSuggestionsService;
 using ntp_snippets::NTPSnippetsFetcher;
-using ntp_snippets::NTPSnippetsScheduler;
+using ntp_snippets::PersistentScheduler;
 using ntp_snippets::RemoteSuggestionsDatabase;
-using ntp_snippets::RemoteSuggestionsProvider;
+using ntp_snippets::RemoteSuggestionsProviderImpl;
 using ntp_snippets::RemoteSuggestionsStatusService;
+using ntp_snippets::SchedulingRemoteSuggestionsProvider;
 using suggestions::CreateIOSImageDecoder;
 using suggestions::ImageFetcherImpl;
 
@@ -142,7 +145,6 @@ IOSChromeContentSuggestionsServiceFactory::BuildServiceInstanceFor(
         OAuth2TokenServiceFactory::GetForBrowserState(chrome_browser_state);
     scoped_refptr<net::URLRequestContextGetter> request_context =
         browser_state->GetRequestContext();
-    NTPSnippetsScheduler* scheduler = nullptr;
     base::FilePath database_dir(
         browser_state->GetStatePath().Append(ntp_snippets::kDatabaseFolder));
     scoped_refptr<base::SequencedTaskRunner> task_runner =
@@ -150,11 +152,10 @@ IOSChromeContentSuggestionsServiceFactory::BuildServiceInstanceFor(
             ->GetSequencedTaskRunnerWithShutdownBehavior(
                 base::SequencedWorkerPool::GetSequenceToken(),
                 base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);
-    std::unique_ptr<RemoteSuggestionsProvider> ntp_snippets_service =
+    std::unique_ptr<RemoteSuggestionsProviderImpl> provider =
         base::MakeUnique<RemoteSuggestionsProvider>(
             service.get(), service->category_factory(), prefs,
             GetApplicationContext()->GetApplicationLocale(),
-            service->user_classifier(), scheduler,
             base::MakeUnique<NTPSnippetsFetcher>(
                 signin_manager, token_service, request_context, prefs,
                 service->category_factory(), nullptr, base::Bind(&ParseJson),
@@ -169,8 +170,15 @@ IOSChromeContentSuggestionsServiceFactory::BuildServiceInstanceFor(
                                                         task_runner),
             base::MakeUnique<RemoteSuggestionsStatusService>(signin_manager,
                                                              prefs));
-    service->set_ntp_snippets_service(ntp_snippets_service.get());
-    service->RegisterProvider(std::move(ntp_snippets_service));
+    service->set_remote_suggestions_provider(provider.get());
+
+    auto scheduling_provider =
+        base::MakeUnique<SchedulingRemoteSuggestionsProvider>(
+            service.get(), service->category_factory(), std::move(provider),
+            /*persistent_scheduler=*/nullptr, service->user_classifier(),
+            prefs);
+    service->set_remote_suggestions_scheduler(scheduling_provider.get());
+    service->RegisterProvider(std::move(scheduling_provider));
   }
 
   return std::move(service);