Reading list downloader retries on recoverable error

ios/chrome/browser/reading_list/reading_list_entry.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_READING_LIST_READING_LIST_ENTRY_H_
 #define IOS_CHROME_BROWSER_READING_LIST_READING_LIST_ENTRY_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 25 matching lines @@
   // The title of the entry. Might be empty.
   const std::string& Title() const;
   // What state this entry is in.
   DistillationState DistilledState() const;
   // The local file URL for the distilled version of the page. This should only
   // be called if the state is "PROCESSED".
   const GURL& DistilledURL() const;
   // The time before the next try. This is automatically increased when the
   // state is set to WILL_RETRY or ERROR from a non-error state.
   base::TimeDelta TimeUntilNextTry() const;
+  // The number of time chrome failed to download this entry. This is
+  // automatically increased when the state is set to WILL_RETRY or ERROR from a
+  // non-error state.
+  int FailedDownloadCounter() const;
 
   ReadingListEntry& operator=(ReadingListEntry&& other);
   bool operator==(const ReadingListEntry& other) const;
 
   // Sets the title.
   void SetTitle(const std::string& title);
   // Sets the distilled URL and switch the state to PROCESSED and reset the time
   // until the next try.
   void SetDistilledURL(const GURL& url);
   // Sets the state to one of PROCESSING, WILL_RETRY or ERROR.
   void SetDistilledState(DistillationState distilled_state);
 
  private:
   GURL url_;
   std::string title_;
   GURL distilled_url_;
   DistillationState distilled_state_;
   std::unique_ptr<net::BackoffEntry> backoff_;
+  int failed_download_counter_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListEntry);
 };
 
 #endif  // IOS_CHROME_BROWSER_READING_LIST_READING_LIST_ENTRY_H_