Add title update merge logic to reading list entry

components/reading_list/ios/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 COMPONENTS_READING_LIST_IOS_READING_LIST_ENTRY_H_
 #define COMPONENTS_READING_LIST_IOS_READING_LIST_ENTRY_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 50 matching lines @@
   int FailedDownloadCounter() const;
   // The read status of the entry.
   bool IsRead() const;
   // Returns if an entry has ever been seen.
   bool HasBeenSeen() const;
 
   // The last update time of the entry. This value may be used to sort the
   // entries. The value is in microseconds since Jan 1st 1970.
   int64_t UpdateTime() const;
 
+  // The last update time of the title of the entry. The value is in
+  // microseconds since Jan 1st 1970.
+  int64_t UpdateTitleTime() const;
+
   // The creation update time of the entry. The value is in microseconds since
   // Jan 1st 1970.
   int64_t CreationTime() const;
 
   // The time when the entry was read for the first time. The value is in
   // microseconds since Jan 1st 1970.
   int64_t FirstReadTime() const;
 
   // Set the update time to now.
   void MarkEntryUpdated();
@@ skipping 41 matching lines @@
   void SetRead(bool read);
 
  private:
   enum State { UNSEEN, UNREAD, READ };
   ReadingListEntry(const GURL& url,
                    const std::string& title,
                    State state,
                    int64_t creation_time,
                    int64_t first_read_time,
                    int64_t update_time,
+                   int64_t update_title_time,
                    ReadingListEntry::DistillationState distilled_state,
                    const base::FilePath& distilled_path,
                    int failed_download_counter,
                    std::unique_ptr<net::BackoffEntry> backoff);
   GURL url_;
   std::string title_;
   State state_;
   base::FilePath distilled_path_;
   DistillationState distilled_state_;
 
   std::unique_ptr<net::BackoffEntry> backoff_;
   int failed_download_counter_;
 
   // These value are in microseconds since Jan 1st 1970. They are used for
   // sorting the entries from the database. They are kept in int64_t to avoid
   // conversion on each save/read event.
   int64_t creation_time_us_;
   int64_t first_read_time_us_;
   int64_t update_time_us_;
+  int64_t update_title_time_us_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListEntry);
 };
 
 #endif  // COMPONENTS_READING_LIST_IOS_READING_LIST_ENTRY_H_