Add ProgressCallback to DriveServiceInterface::DownloadFile.

chrome/browser/google_apis/gdata_wapi_service.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_SERVICE_H_
 #define CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_SERVICE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 81 matching lines @@
       const GetAboutResourceCallback& callback) OVERRIDE;
   virtual void GetAppList(const GetAppListCallback& callback) OVERRIDE;
   virtual void DeleteResource(const std::string& resource_id,
                               const std::string& etag,
                               const EntryActionCallback& callback) OVERRIDE;
   virtual void DownloadFile(
       const base::FilePath& virtual_path,
       const base::FilePath& local_cache_path,
       const GURL& download_url,
       const DownloadActionCallback& download_action_callback,
-      const GetContentCallback& get_content_callback) OVERRIDE;
+      const GetContentCallback& get_content_callback,
+      const ProgressCallback& progress_callback) OVERRIDE;
   virtual void CopyHostedDocument(
       const std::string& resource_id,
       const std::string& new_name,
       const GetResourceEntryCallback& callback) OVERRIDE;
   virtual void RenameResource(
       const std::string& resource_id,
       const std::string& new_name,
       const EntryActionCallback& callback) OVERRIDE;
   virtual void AddResourceToDirectory(
       const std::string& parent_resource_id,
@@ skipping 60 matching lines @@
   // reference, as they may outlive this object.
   const GDataWapiUrlGenerator url_generator_;
   const std::string custom_user_agent_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataWapiService);
 };
 
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_SERVICE_H_