[Offline Pages] Set up the initial prefetching service.

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 51 matching lines @@
 #include "chrome/browser/android/chrome_feature_list.h"
 #include "chrome/browser/android/ntp/ntp_snippets_launcher.h"
 #include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
 #include "chrome/browser/android/offline_pages/request_coordinator_factory.h"
 #include "chrome/browser/download/download_history.h"
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/download/download_service_factory.h"
 #include "chrome/browser/ntp_snippets/download_suggestions_provider.h"
 #include "components/ntp_snippets/offline_pages/recent_tab_suggestions_provider.h"
 #include "components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h"
+#include "components/offline_pages/content/suggested_articles_observer.h"
 #include "components/offline_pages/core/background/request_coordinator.h"
 #include "components/offline_pages/core/offline_page_feature.h"
 #include "components/offline_pages/core/offline_page_model.h"
 #include "components/offline_pages/core/recent_tabs/recent_tabs_ui_adapter_delegate.h"
 #include "components/physical_web/data_source/physical_web_data_source.h"
 
 using content::DownloadManager;
 using ntp_snippets::PhysicalWebPageSuggestionsProvider;
 using ntp_snippets::RecentTabSuggestionsProvider;
 using offline_pages::OfflinePageModel;
@@ skipping 284 matching lines @@
   bool show_offline_page_downloads =
       !IsChromeHomeEnabled() &&
       base::FeatureList::IsEnabled(
           features::kOfflinePageDownloadSuggestionsFeature);
   if (show_asset_downloads || show_offline_page_downloads) {
     RegisterDownloadsProvider(
         show_offline_page_downloads ? offline_page_model : nullptr,
         show_asset_downloads ? download_manager : nullptr, download_history,
         service, pref_service);
   }
+
+  offline_pages::SuggestedArticlesObserver::ObserveContentSuggestionsService(
+      profile, service);
 #endif  // OS_ANDROID
 
   // |bookmark_model| can be null in tests.
   if (base::FeatureList::IsEnabled(ntp_snippets::kBookmarkSuggestionsFeature) &&
       bookmark_model && !IsChromeHomeEnabled()) {
     RegisterBookmarkProvider(bookmark_model, service, pref_service);
   }
 
 #if defined(OS_ANDROID)
   if (IsPhysicalWebPageProviderEnabled()) {
@@ skipping 12 matching lines @@
           ntp_snippets::kForeignSessionsSuggestionsFeature)) {
     RegisterForeignSessionsProvider(sync_service, service, pref_service);
   }
 
   return service;
 
 #else
   return nullptr;
 #endif  // CONTENT_SUGGESTIONS_ENABLED
 }