Reading list downloader retries on recoverable error

ios/chrome/browser/reading_list/reading_list_download_service.h

Index: ios/chrome/browser/reading_list/reading_list_download_service.h
diff --git a/ios/chrome/browser/reading_list/reading_list_download_service.h b/ios/chrome/browser/reading_list/reading_list_download_service.h
index 2c23710615c67cf10098764598db6cb6e984202b..bbe08105a39c7aa736144ddff137a6d60f67d24a 100644
--- a/ios/chrome/browser/reading_list/reading_list_download_service.h
+++ b/ios/chrome/browser/reading_list/reading_list_download_service.h
@@ -9,6 +9,7 @@
 #include "components/keyed_service/core/keyed_service.h"
 #include "ios/chrome/browser/reading_list/reading_list_model_observer.h"
 #include "ios/chrome/browser/reading_list/url_downloader.h"
+#include "net/base/network_change_notifier.h"
 
 class GURL;
 class PrefService;
@@ -25,8 +26,10 @@ class DomDistillerService;
 // Any calls made to DownloadAllEntries/DownloadEntry before the model is
 // loaded will be ignored. When the model is loaded, DownloadAllEntries will be
 // called automatically.
-class ReadingListDownloadService : public KeyedService,
-                                   public ReadingListModelObserver {
+class ReadingListDownloadService
+    : public KeyedService,
+      public ReadingListModelObserver,
+      public net::NetworkChangeNotifier::ConnectionTypeObserver {
  public:
   ReadingListDownloadService(
       ReadingListModel* reading_list_model,
@@ -56,6 +59,18 @@ class ReadingListDownloadService : public KeyedService,
   // Tries to save offline versions of all entries in the reading list that are
   // not yet saved. Must only be called after reading list model is loaded.
   void DownloadAllEntries();
+  // Schedule a download of an offline version of the reading list entry,
+  // according to the delay of the entry. Must only be called after reading list
+  // model is loaded.
+  void ScheduleDownloadEntry(const ReadingListEntry& entry);
+  // Tries to save an offline version of the reading list entry corresponding to
+  // the |url| if it is not yet saved. Must only be called after reading list
+  // model is loaded.
+  void DownloadEntryFromURL(const GURL& url);
+  // Schedule a download of an offline version of the reading list entry
+  // associated to this |url|, according to the delay of the entry. Must only be
+  // called after reading list model is loaded.
+  void ScheduleDownloadEntryFromURL(const GURL& url);
   // Tries to save an offline version of the reading list entry if it is not yet
   // saved. Must only be called after reading list model is loaded.
   void DownloadEntry(const ReadingListEntry& entry);
@@ -71,8 +86,17 @@ class ReadingListDownloadService : public KeyedService,
   // Callback for entry deletion.
   void OnDeleteEnd(const GURL& url, bool success);
 
+  // net::NetworkChangeNotifier::ConnectionTypeObserver:
+  void OnConnectionTypeChanged(
+      net::NetworkChangeNotifier::ConnectionType type) override;
+
   ReadingListModel* reading_list_model_;
   std::unique_ptr<URLDownloader> url_downloader_;
+  std::vector<GURL> url_to_download_cellular_;
+  std::vector<GURL> url_to_download_wifi_;
+  bool had_connection_;
+
+  base::WeakPtrFactory<ReadingListDownloadService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListDownloadService);
 };