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

chrome/browser/ntp_snippets/content_suggestions_service_factory.cc

Index: chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
diff --git a/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc b/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
index 87cc2830272571b6a1614bec43d1bf49231bf018..68877623886fc00d8da683ddccd5269f47c36ca1 100644
--- a/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
+++ b/chrome/browser/ntp_snippets/content_suggestions_service_factory.cc
@@ -58,21 +58,26 @@
 #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/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;
+using offline_pages::RequestCoordinator;
 using offline_pages::OfflinePageModelFactory;
+using offline_pages::RequestCoordinatorFactory;
 using physical_web::PhysicalWebDataSource;
 #endif  // OS_ANDROID
 
@@ -119,10 +124,14 @@ bool IsRecentTabProviderEnabled() {
 }
 
 void RegisterRecentTabProvider(OfflinePageModel* offline_page_model,
+                               RequestCoordinator* request_coordinator,
                                ContentSuggestionsService* service,
                                PrefService* pref_service) {
+  offline_pages::DownloadUIAdapter* ui_adapter = offline_pages::
+      RecentTabsUIAdapterDelegate::GetOrCreateRecentTabsUIAdapter(
+          offline_page_model, request_coordinator);
   auto provider = base::MakeUnique<RecentTabSuggestionsProvider>(
-      service, offline_page_model, pref_service);
+      service, ui_adapter, pref_service);
   service->RegisterProvider(std::move(provider));
 }
 
@@ -289,6 +298,8 @@ KeyedService* ContentSuggestionsServiceFactory::BuildServiceInstanceFor(
 #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 =
@@ -308,7 +319,8 @@ KeyedService* ContentSuggestionsServiceFactory::BuildServiceInstanceFor(
 
 #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 =