Implement retry flow on DriveUploader.

chrome/browser/google_apis/drive_uploader.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_DRIVE_UPLOADER_H_
 #define CHROME_BROWSER_GOOGLE_APIS_DRIVE_UPLOADER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 106 matching lines @@
                                 const GURL& upload_location);
 
   // Uploads the next chunk of data from the file.
   void UploadNextChunk(scoped_ptr<UploadFileInfo> upload_file_info);
 
   // net::FileStream::Read completion callback.
   void ReadCompletionCallback(scoped_ptr<UploadFileInfo> upload_file_info,
                               int bytes_to_read,
                               int bytes_read);
 
-  // Calls DriveService's ResumeUpload with the current upload info.
+  // Call DriveServer's ResumeUpload with the current remaining chunk of data.

[satorux1, 2013/02/07 05:48:32]

Calls ?

+  // |start_position| should be the position in the file, and it must be
+  // in the current chunk range. In other words, the actual data range sent
+  // to the server will be |start_position| to the end of the current chunk.
   void ResumeUpload(scoped_ptr<UploadFileInfo> upload_file_info,
-                    int bytes_to_send);
+                    int64 start_position);
 
   // DriveService callback for ResumeUpload.
   void OnUploadRangeResponseReceived(
       scoped_ptr<UploadFileInfo> upload_file_info,
       const UploadRangeResponse& response,
       scoped_ptr<ResourceEntry> entry);
 
+  // The server may return 5xx server error response.
+  // In such a case, following two methods will try to resume the upload.
+  // Note that in order to avoid receiving many server errors (like
+  // when the server is overloaded), this method will wait for
+  // a certain period before connecting to the server again.
+  void ResumeInterruptedUpload(
+      scoped_ptr<UploadFileInfo> upload_file_info);
+  void ResumeInterruptedUploadAfterWait(
+      scoped_ptr<UploadFileInfo> upload_file_info);
+
   // Handle failed uploads.
   void UploadFailed(scoped_ptr<UploadFileInfo> upload_file_info,
                     DriveUploadError error);
 
   // Pointers to DriveServiceInterface object owned by DriveSystemService.
   // The lifetime of this object is guaranteed to exceed that of the
   // DriveUploader instance.
   DriveServiceInterface* drive_service_;
 
   // TaskRunner for opening, reading, and closing files.
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DriveUploader> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveUploader);
 };
 
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_DRIVE_UPLOADER_H_