Added member data to classes to support download resumption.

content/browser/download/download_create_info.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_CREATE_INFO_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_CREATE_INFO_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 70 matching lines @@
   std::string content_disposition;
 
   // The mime type string from the response header (may be overridden).
   std::string mime_type;
 
   // The value of the content type header sent with the downloaded item.  It
   // may be different from |mime_type|, which may be set based on heuristics
   // which may look at the file extension and first few bytes of the file.
   std::string original_mime_type;
 
+  // For continuing a download, the modification time of the file.
+  // Storing as a string for exact match to server format on
+  // "If-Unmodified-Since" comparison.
+  std::string last_modified;
+
+  // For continuing a download, the ETAG of the file.
+  std::string etag;
+
   // True if we should display the 'save as...' UI and prompt the user
   // for the download location.
-  // False if the UI should be supressed and the download performed to the
+  // False if the UI should be suppressed and the download performed to the
   // default location.
   bool prompt_user_for_save_location;
 
   // The original name for a dangerous download.
   FilePath original_name;
 
   // The charset of the referring page where the download request comes from.
   // It's used to construct a suggested filename.
   std::string referrer_charset;
 
   // The download file save info.
   DownloadSaveInfo save_info;
 
   // The remote IP address where the download was fetched from.  Copied from
   // UrlRequest::GetSocketAddress().
   std::string remote_address;
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_CREATE_INFO_H_