[Background fetching] Background fetching when opening an NTP.

chrome/browser/ntp_snippets/content_suggestions_service_factory.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/ntp_snippets/content_suggestions_service_factory.h"
 
 #include <utility>
 
 #include "base/feature_list.h"
 #include "base/files/file_path.h"
@@ skipping 175 matching lines @@
                                                        pref_service));
 
   PersistentScheduler* scheduler = nullptr;
 #if defined(OS_ANDROID)
   scheduler = NTPSnippetsLauncher::Get();
 #endif  // OS_ANDROID
 
   auto scheduling_provider =
       base::MakeUnique<SchedulingRemoteSuggestionsProvider>(
           service, std::move(provider), scheduler, service->user_classifier(),
-          pref_service);
+          pref_service, base::MakeUnique<base::DefaultClock>());
   service->set_remote_suggestions_provider(scheduling_provider.get());
   service->set_remote_suggestions_scheduler(scheduling_provider.get());
   service->RegisterProvider(std::move(scheduling_provider));
 }
 
 void RegisterForeignSessionsProvider(SyncService* sync_service,
                                      ContentSuggestionsService* service,
                                      PrefService* pref_service) {
   std::unique_ptr<TabDelegateSyncAdapter> sync_adapter =
       base::MakeUnique<TabDelegateSyncAdapter>(sync_service);
@@ skipping 122 matching lines @@
                             language_model, pref_service, profile);
   }
 
   if (base::FeatureList::IsEnabled(
           ntp_snippets::kForeignSessionsSuggestionsFeature)) {
     RegisterForeignSessionsProvider(sync_service, service, pref_service);
   }
 
   return service;
 }