Add ProgressCallback to DriveServiceInterface::DownloadFile.

chrome/browser/sync_file_system/drive_file_sync_client.cc

 // 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.
 
 #include "chrome/browser/sync_file_system/drive_file_sync_client.h"
 
 #include <algorithm>
 #include <functional>
 #include <sstream>
 #include <string>
@@ skipping 608 matching lines @@
     return;
   }
 
   DVLOG(2) << "Downloading file: " << entry->resource_id();
   drive_service_->DownloadFile(
       base::FilePath(kDummyDrivePath),
       local_file_path,
       entry->download_url(),
       base::Bind(&DriveFileSyncClient::DidDownloadFile,
                  AsWeakPtr(), entry->file_md5(), callback),
-      google_apis::GetContentCallback());
+      google_apis::GetContentCallback(),
+      google_apis::ProgressCallback());
 }
 
 void DriveFileSyncClient::DidDownloadFile(
     const std::string& downloaded_file_md5,
     const DownloadFileCallback& callback,
     google_apis::GDataErrorCode error,
     const base::FilePath& downloaded_file_path) {
   DCHECK(CalledOnValidThread());
   if (error == google_apis::HTTP_SUCCESS)
     DVLOG(2) << "Download completed";
@@ skipping 328 matching lines @@
     return;
   for (UploadCallbackMap::iterator iter = upload_callback_map_.begin();
        iter != upload_callback_map_.end(); ++iter) {
     iter->second.Run(error, std::string(), std::string());
   }
   upload_callback_map_.clear();
   drive_uploader_.reset(new google_apis::DriveUploader(drive_service_.get()));
 }
 
 }  // namespace sync_file_system