Range request support for parallel download in DownloadRequestCore.

content/public/browser/download_url_parameters.h

Index: content/public/browser/download_url_parameters.h
diff --git a/content/public/browser/download_url_parameters.h b/content/public/browser/download_url_parameters.h
index 41b0ed637bdbb3dca8662e6c0309594f734e94f7..2f91d08b5a0c55b2684bb2ac096e89fc45f00eda 100644
--- a/content/public/browser/download_url_parameters.h
+++ b/content/public/browser/download_url_parameters.h
@@ -168,9 +168,11 @@ class CONTENT_EXPORT DownloadUrlParameters {
   }
 
   // If |offset| is non-zero, then a byte range request will be issued to fetch
-  // the range of bytes starting at |offset| through to the end of thedownload.
+  // the range of bytes starting at |offset| through to the end of the download.
   void set_offset(int64_t offset) { save_info_.offset = offset; }
 
+  void set_length(int64_t length) { save_info_.length = length; }

[David Trainor- moved to gerrit, 2017/02/01 07:14:36]

Add a comment here along the lines of the one in DownloadSaveInfo IMO.

[xingliu, 2017/02/01 20:25:46]

Done. Also added some comment for set_offset.

+
   // If |offset| is non-zero, then |hash_of_partial_file| contains the raw
   // SHA-256 hash of the first |offset| bytes of the target file. Only
   // meaningful if a partial file exists and is identified by either the
@@ -239,6 +241,7 @@ class CONTENT_EXPORT DownloadUrlParameters {
     return save_info_.suggested_name;
   }
   int64_t offset() const { return save_info_.offset; }
+  int64_t length() const { return save_info_.length; }
   const std::string& hash_of_partial_file() const {
     return save_info_.hash_of_partial_file;
   }