Support range uploading of a file.

net/url_request/url_fetcher.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 NET_URL_REQUEST_URL_FETCHER_H_
 #define NET_URL_REQUEST_URL_FETCHER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 117 matching lines @@
   // |upload_content| is the data to be sent (the Content-Length header value
   // will be set to the length of this data).
   virtual void SetUploadData(const std::string& upload_content_type,
                              const std::string& upload_content) = 0;
 
   // Sets data only needed by POSTs.  All callers making POST requests should
   // call one of the SetUpload* methods before the request is started.
   // |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.
   // This may only be called before calling Start().
   // Use AppendChunkToUpload() to give the data chunks after calling Start().
   virtual void SetChunkedUpload(const std::string& upload_content_type) = 0;
 
   // Adds the given bytes to a request's POST data transmitted using chunked
   // transfer encoding.
   // This method should be called ONLY after calling Start().
@@ skipping 135 matching lines @@
   // be removed once the URLFetcher is destroyed.  User should not take
   // ownership more than once, or call this method after taking ownership.
   virtual bool GetResponseAsFilePath(
       bool take_ownership,
       base::FilePath* out_response_path) const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_FETCHER_H_