Added last_access_time to DownloadItem and History DB

components/history/core/browser/download_row.h

Index: components/history/core/browser/download_row.h
diff --git a/components/history/core/browser/download_row.h b/components/history/core/browser/download_row.h
index 1c47635aeed0b0a8e56192d12f09b8d8ae043a0d..cb0f0cc83862d4f9ce3d742460486b3de100291f 100644
--- a/components/history/core/browser/download_row.h
+++ b/components/history/core/browser/download_row.h
@@ -33,8 +33,8 @@ struct DownloadRow {
               const std::string& http_method,
               const std::string& mime_type,
               const std::string& original_mime_type,
-              const base::Time& start,
-              const base::Time& end,
+              base::Time start,
+              base::Time end,
               const std::string& etag,
               const std::string& last_modified,
               int64_t received,
@@ -46,6 +46,7 @@ struct DownloadRow {
               DownloadId id,
               const std::string& guid,
               bool download_opened,
+              base::Time last_access,
               const std::string& ext_id,
               const std::string& ext_name,
               const std::vector<DownloadSliceInfo>& download_slice_info);
@@ -134,6 +135,9 @@ struct DownloadRow {
   // 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;
+
   // The id and name of the extension that created this download.
   std::string by_ext_id;
   std::string by_ext_name;