Downloads: Added transient flag to download item and download database

components/history/core/browser/download_row.h

 // Copyright (c) 2012 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_HISTORY_CORE_BROWSER_DOWNLOAD_ROW_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_DOWNLOAD_ROW_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 29 matching lines @@
               int64_t received,
               int64_t total,
               DownloadState download_state,
               DownloadDangerType danger_type,
               DownloadInterruptReason interrupt_reason,
               const std::string& hash,
               DownloadId id,
               const std::string& guid,
               bool download_opened,
               base::Time last_access,
+              bool transient,
               const std::string& ext_id,
               const std::string& ext_name,
               const std::vector<DownloadSliceInfo>& download_slice_info);
   DownloadRow(const DownloadRow& other);
   ~DownloadRow();
 
   bool operator==(const DownloadRow&) const;
 
   // The current path to the download (potentially different from final if
   // download is in progress or interrupted).
@@ skipping 71 matching lines @@
 
   // The GUID of the download in the database. Not changed by UpdateDownload().
   std::string guid;
 
   // Whether this download has ever been opened from the browser.
   bool opened;
 
   // The time when the download was last accessed.
   base::Time last_access_time;
 
+  // Whether this download is transient. Transient items are cleaned up after
+  // completion and not shown in the UI.
+  bool transient;
+
   // The id and name of the extension that created this download.
   std::string by_ext_id;
   std::string by_ext_name;
 
   // Data slices that have been downloaded so far. The slices must be ordered
   // by their offset.
   std::vector<DownloadSliceInfo> download_slice_info;
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_DOWNLOAD_ROW_H_