Only show Last N Pages in the UI when the corresponding tab is visible.

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 24 matching lines @@
 #include "components/ntp_snippets/features.h"
 #include "components/ntp_snippets/ntp_snippets_constants.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_fetcher.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"
 #include "components/ntp_snippets/sessions/tab_delegate_sync_adapter.h"
+#include "components/offline_pages/core/recent_tabs/recent_tabs_ui_adapter_delegate.h"

[vitaliii, 2017/02/15 10:12:15]

Shouldn't this be in OS_ANDROID block?

[dewittj, 2017/02/15 19:49:44]

Done.

 #include "components/prefs/pref_service.h"
 #include "components/safe_json/safe_json_parser.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "components/translate/core/browser/language_model.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/storage_partition.h"
 #include "google_apis/google_api_keys.h"
 #include "net/url_request/url_request_context_getter.h"
 
 #if defined(OS_ANDROID)
 #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/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/physical_web/data_source/physical_web_data_source.h"
 
 using content::DownloadManager;
 using ntp_snippets::PhysicalWebPageSuggestionsProvider;
 using ntp_snippets::RecentTabSuggestionsProvider;
 using offline_pages::OfflinePageModel;
+using offline_pages::RequestCoordinator;
 using offline_pages::OfflinePageModelFactory;
+using offline_pages::RequestCoordinatorFactory;
 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;
@@ skipping 26 matching lines @@
 #if defined(OS_ANDROID)
 
 bool IsRecentTabProviderEnabled() {
   return base::FeatureList::IsEnabled(
              ntp_snippets::kRecentOfflineTabSuggestionsFeature) &&
          base::FeatureList::IsEnabled(
              offline_pages::kOffliningRecentPagesFeature);
 }
 
 void RegisterRecentTabProvider(OfflinePageModel* offline_page_model,
+                               RequestCoordinator* request_coordinator,
                                ContentSuggestionsService* service,
                                PrefService* pref_service) {
   auto provider = base::MakeUnique<RecentTabSuggestionsProvider>(
-      service, offline_page_model, pref_service);
+      service, offline_page_model, request_coordinator, pref_service);
   service->RegisterProvider(std::move(provider));
 }
 
 void RegisterDownloadsProvider(OfflinePageModel* offline_page_model,
                                DownloadManager* download_manager,
                                DownloadHistory* download_history,
                                ContentSuggestionsService* service,
                                PrefService* pref_service) {
   auto provider = base::MakeUnique<DownloadSuggestionsProvider>(
       service, offline_page_model, download_manager, download_history,
@@ skipping 146 matching lines @@
   std::unique_ptr<CategoryRanker> category_ranker =
       ntp_snippets::BuildSelectedCategoryRanker(
           pref_service, base::MakeUnique<base::DefaultClock>());
   auto* service =
       new ContentSuggestionsService(State::ENABLED, signin_manager,
           history_service, pref_service, std::move(category_ranker));
 
 #if defined(OS_ANDROID)
   OfflinePageModel* offline_page_model =
       OfflinePageModelFactory::GetForBrowserContext(profile);
+  RequestCoordinator* request_coordinator =
+      RequestCoordinatorFactory::GetForBrowserContext(profile);
   DownloadManager* download_manager =
       content::BrowserContext::GetDownloadManager(profile);
   DownloadService* download_service =
       DownloadServiceFactory::GetForBrowserContext(profile);
   DownloadHistory* download_history = download_service->GetDownloadHistory();
   PhysicalWebDataSource* physical_web_data_source =
       g_browser_process->GetPhysicalWebDataSource();
 #endif  // OS_ANDROID
   BookmarkModel* bookmark_model =
       BookmarkModelFactory::GetForBrowserContext(profile);
   OAuth2TokenService* token_service =
       ProfileOAuth2TokenServiceFactory::GetForProfile(profile);
   SyncService* sync_service =
       ProfileSyncServiceFactory::GetSyncServiceForBrowserContext(profile);
   LanguageModel* language_model =
       LanguageModelFactory::GetInstance()->GetForBrowserContext(profile);
 
 #if defined(OS_ANDROID)
   if (IsRecentTabProviderEnabled()) {
-    RegisterRecentTabProvider(offline_page_model, service, pref_service);
+    RegisterRecentTabProvider(offline_page_model, request_coordinator, service,
+                              pref_service);
   }
 
   bool show_asset_downloads =
       base::FeatureList::IsEnabled(features::kAssetDownloadSuggestionsFeature);
   bool show_offline_page_downloads = 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,
@@ skipping 23 matching lines @@
           ntp_snippets::kForeignSessionsSuggestionsFeature)) {
     RegisterForeignSessionsProvider(sync_service, service, pref_service);
   }
 
   return service;
 
 #else
   return nullptr;
 #endif  // CONTENT_SUGGESTIONS_ENABLED
 }