Implement retry flow on DriveUploader.

chrome/browser/google_apis/drive_uploader.h

Index: chrome/browser/google_apis/drive_uploader.h
diff --git a/chrome/browser/google_apis/drive_uploader.h b/chrome/browser/google_apis/drive_uploader.h
index c18f2a8344aa540cd35b5de1614c5c966363e1f1..1edfdfc07b597075bf2a050a8819c40011bf8c7f 100644
--- a/chrome/browser/google_apis/drive_uploader.h
+++ b/chrome/browser/google_apis/drive_uploader.h
@@ -124,9 +124,12 @@ class DriveUploader : public DriveUploaderInterface {
                               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(
@@ -134,6 +137,16 @@ class DriveUploader : public DriveUploaderInterface {
       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);