Support range uploading of a file.

net/url_request/url_fetcher.h

Index: net/url_request/url_fetcher.h
diff --git a/net/url_request/url_fetcher.h b/net/url_request/url_fetcher.h
index 9d2be1d80b51e61c6f0b4246a628232319ac02c7..c8a587dbc885f74b221fd4b06d02fad839b34514 100644
--- a/net/url_request/url_fetcher.h
+++ b/net/url_request/url_fetcher.h
@@ -135,10 +135,14 @@ class NET_EXPORT URLFetcher {
   // |upload_content_type| is the MIME type of the content, while
   // |file_path| is the path to the file containing the data to be sent (the
   // Content-Length header value will be set to the length of this file).
+  // |range_offset| and |range_length| specify the range of the part
+  // to be uploaded. To upload the whole file, (0, kuint64max) can be used.
   // |file_task_runner| will be used for all file operations.
   virtual void SetUploadFilePath(
       const std::string& upload_content_type,
       const base::FilePath& file_path,
+      uint64 range_offset,
+      uint64 range_length,
       scoped_refptr<base::TaskRunner> file_task_runner) = 0;
 
   // Indicates that the POST data is sent via chunked transfer encoding.