[NTP::SectionOrder] Add a flag to choose category ranker.

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 11 matching lines @@
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_features.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/browser_sync/profile_sync_service.h"
 #include "components/image_fetcher/image_decoder.h"
 #include "components/image_fetcher/image_fetcher.h"
 #include "components/image_fetcher/image_fetcher_impl.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/keyed_service/core/service_access_type.h"
 #include "components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h"
-#include "components/ntp_snippets/category_rankers/constant_category_ranker.h"
+#include "components/ntp_snippets/category_rankers/category_ranker.h"
 #include "components/ntp_snippets/content_suggestions_service.h"
 #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_impl.h"
 #include "components/ntp_snippets/remote/remote_suggestions_status_service.h"
 #include "components/ntp_snippets/remote/scheduling_remote_suggestions_provider.h"
 #include "components/ntp_snippets/sessions/foreign_sessions_suggestions_provider.h"
@@ skipping 26 matching lines @@
 using offline_pages::OfflinePageModel;
 using offline_pages::OfflinePageModelFactory;
 using physical_web::PhysicalWebDataSource;
 #endif  // OS_ANDROID
 
 using bookmarks::BookmarkModel;
 using content::BrowserThread;
 using history::HistoryService;
 using image_fetcher::ImageFetcherImpl;
 using ntp_snippets::BookmarkSuggestionsProvider;
+using ntp_snippets::CategoryRanker;
 using ntp_snippets::ContentSuggestionsService;
 using ntp_snippets::ForeignSessionsSuggestionsProvider;
 using ntp_snippets::NTPSnippetsFetcher;
 using ntp_snippets::PersistentScheduler;
 using ntp_snippets::RemoteSuggestionsDatabase;
 using ntp_snippets::RemoteSuggestionsProviderImpl;
 using ntp_snippets::RemoteSuggestionsStatusService;
 using ntp_snippets::SchedulingRemoteSuggestionsProvider;
 using ntp_snippets::TabDelegateSyncAdapter;
 using suggestions::ImageDecoderImpl;
@@ skipping 156 matching lines @@
   // Create the ContentSuggestionsService.
   State state =
       base::FeatureList::IsEnabled(ntp_snippets::kContentSuggestionsFeature)
           ? State::ENABLED
           : State::DISABLED;
   SigninManagerBase* signin_manager =
       SigninManagerFactory::GetForProfile(profile);
   HistoryService* history_service = HistoryServiceFactory::GetForProfile(
       profile, ServiceAccessType::EXPLICIT_ACCESS);
   PrefService* pref_service = profile->GetPrefs();
-  auto category_ranker =
-      base::MakeUnique<ntp_snippets::ConstantCategoryRanker>();
+  std::unique_ptr<CategoryRanker> category_ranker =
+      ntp_snippets::BuildSelectedCategoryRanker(pref_service);
   auto* service =
       new ContentSuggestionsService(state, signin_manager, history_service,
                                     pref_service, std::move(category_ranker));
   if (state == State::DISABLED) {
     // Since we won't initialise the services, they won't get a chance to
     // unschedule their tasks. We do it explicitly here instead.
     ClearScheduledTasks();
     return service;
   }
 
@@ skipping 51 matching lines @@
                             language_model, pref_service, profile);
   }
 
   if (base::FeatureList::IsEnabled(
           ntp_snippets::kForeignSessionsSuggestionsFeature)) {
     RegisterForeignSessionsProvider(sync_service, service, pref_service);
   }
 
   return service;
 }