Defer ARC file system operations while ARC is booting.

chrome/browser/chromeos/arc/fileapi/arc_file_system_instance_util.h

-// Copyright 2016 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_CHROMEOS_ARC_FILEAPI_ARC_FILE_SYSTEM_INSTANCE_UTIL_H_
-#define CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_FILE_SYSTEM_INSTANCE_UTIL_H_
-
-#include <string>
-
-#include "components/arc/common/file_system.mojom.h"
-
-class GURL;
-
-namespace arc {
-namespace file_system_instance_util {
-
-using GetFileSizeCallback = mojom::FileSystemInstance::GetFileSizeCallback;
-using OpenFileToReadCallback =
-    mojom::FileSystemInstance::OpenFileToReadCallback;
-using GetDocumentCallback = mojom::FileSystemInstance::GetDocumentCallback;
-using GetChildDocumentsCallback =
-    mojom::FileSystemInstance::GetChildDocumentsCallback;
-
-// Utility functions to post a task to run FileSystemInstance methods.
-// These functions must be called on the IO thread.
-void GetFileSizeOnIOThread(const GURL& arc_url,
-                           const GetFileSizeCallback& callback);
-void OpenFileToReadOnIOThread(const GURL& arc_url,
-                              const OpenFileToReadCallback& callback);
-void GetDocumentOnIOThread(const std::string& authority,
-                           const std::string& document_id,
-                           const GetDocumentCallback& callback);
-void GetChildDocumentsOnIOThread(const std::string& authority,
-                                 const std::string& parent_document_id,
-                                 const GetChildDocumentsCallback& callback);
-
-}  // namespace file_system_instance_util
-}  // namespace arc
-
-#endif  // CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_FILE_SYSTEM_INSTANCE_UTIL_H_