Implement a DRIVE_REQUEST_TOO_LARGE backoff.

chrome/browser/drive/drive_api_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_DRIVE_DRIVE_API_SERVICE_H_
 #define CHROME_BROWSER_DRIVE_DRIVE_API_SERVICE_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/threading/thread_checker.h"
 #include "chrome/browser/drive/drive_service_interface.h"
 #include "google_apis/drive/auth_service_interface.h"
 #include "google_apis/drive/auth_service_observer.h"
 #include "google_apis/drive/drive_api_url_generator.h"
 
 class GURL;
 class OAuth2TokenService;
 
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
 }
 
 namespace google_apis {
+class FilesListRequestRunner;
 class RequestSender;
 namespace drive {
 class BatchUploadRequest;
 }  // namespace drive
 }  // namespace google_apis
 
 namespace net {
 class URLRequestContextGetter;
 }  // namespace net
 
@@ skipping 209 matching lines @@
   // AuthServiceObserver override.
   void OnOAuth2RefreshTokenChanged() override;
 
   // The class is expected to run on UI thread.
   base::ThreadChecker thread_checker_;
 
   OAuth2TokenService* oauth2_token_service_;
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
   scoped_ptr<google_apis::RequestSender> sender_;
+  scoped_ptr<google_apis::FilesListRequestRunner> files_list_request_runner_;
   base::ObserverList<DriveServiceObserver> observers_;
   google_apis::DriveApiUrlGenerator url_generator_;
   const std::string custom_user_agent_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveAPIService);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_DRIVE_DRIVE_API_SERVICE_H_