Revert of Revert of Drive: Let DriveUploader use batch request API.

chrome/browser/sync_file_system/drive_backend/fake_drive_uploader.h

 // Copyright 2014 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_SYNC_FILE_SYSTEM_DRIVE_BACKEND_FAKE_DRIVE_UPLOADER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_FAKE_DRIVE_UPLOADER_H_
 
 #include <string>
 
 #include "base/files/file_util.h"
@@ skipping 32 matching lines @@
 };
 
 // A fake implementation of DriveUploaderInterface, which provides fake
 // behaviors for file uploading.
 class FakeDriveUploader : public drive::DriveUploaderInterface {
  public:
   explicit FakeDriveUploader(FakeDriveServiceWrapper* fake_drive_service);
   ~FakeDriveUploader() override;
 
   // DriveUploaderInterface overrides.
+  void StartBatchProcessing() override;
+  void StopBatchProcessing() override;
   google_apis::CancelCallback UploadNewFile(
       const std::string& parent_resource_id,
       const base::FilePath& local_file_path,
       const std::string& title,
       const std::string& content_type,
       const drive::UploadNewFileOptions& options,
       const drive::UploadCompletionCallback& callback,
       const google_apis::ProgressCallback& progress_callback) override;
   google_apis::CancelCallback UploadExistingFile(
       const std::string& resource_id,
@@ skipping 17 matching lines @@
   FakeDriveServiceWrapper* fake_drive_service_;
   bool make_file_conflict_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeDriveUploader);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_FAKE_DRIVE_UPLOADER_H_