Implement retry flow on DriveUploader.

chrome/browser/google_apis/gdata_wapi_operations.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 CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_OPERATIONS_H_
 #define CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_OPERATIONS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 491 matching lines @@
 
 // Struct for passing params needed for DriveServiceInterface::ResumeUpload()
 // calls.
 struct ResumeUploadParams {
   ResumeUploadParams(UploadMode upload_mode,
                      int64 start_position,
                      int64 end_position,
                      int64 content_length,
                      const std::string& content_type,
                      scoped_refptr<net::IOBuffer> buf,
+                     int64 buf_offset,
                      const GURL& upload_location,
                      const FilePath& drive_file_path);
   ~ResumeUploadParams();
 
   const UploadMode upload_mode;  // Mode of the upload.
   // Start of range of contents currently stored in |buf|.
   const int64 start_position;
   // End of range of contents currently stored in |buf|. This is exclusive.
   // For instance, if you are to upload the first 500 bytes of data,
   // |start_position| is 0 and |end_position| is 500.
   const int64 end_position;
   const int64 content_length;  // File content-Length.
   const std::string content_type;   // Content-Type of file.
   // Holds current content to be uploaded.
   const scoped_refptr<net::IOBuffer> buf;
+  // The offset of the available data from the beginning of the buf.
+  const int64 buf_offset;
   const GURL upload_location;   // Url of where to upload the file to.
   // Drive file path of the file seen in the UI. Not necessary for
   // resuming an upload, but used for adding an entry to OperationRegistry.
   // TODO(satorux): Remove the drive file path hack. crbug.com/163296
   const FilePath drive_file_path;
 };
 
 // This class performs the operation for resuming the upload of a file.
 // More specifically, this operation uploads a chunk of data carried in |buf|
 // of ResumeUploadResponse.
@@ skipping 50 matching lines @@
 
  private:
   const int64 content_length_;
 
   DISALLOW_COPY_AND_ASSIGN(GetUploadStatusOperation);
 };
 
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_OPERATIONS_H_