AppShell: Enable chrome.fileSystem.retainEntry/restoreEntry

extensions/shell/browser/api/file_system/shell_file_system_delegate.h

+// Copyright 2017 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 EXTENSIONS_SHELL_BROWSER_API_FILE_SYSTEM_SHELL_FILE_SYSTEM_DELEGATE_H_
+#define EXTENSIONS_SHELL_BROWSER_API_FILE_SYSTEM_SHELL_FILE_SYSTEM_DELEGATE_H_
+
+#include "extensions/browser/api/file_system/file_system_delegate.h"
+
+namespace extensions {
+
+class ShellFileSystemDelegate : public FileSystemDelegate {
+ public:
+  ShellFileSystemDelegate();
+  ~ShellFileSystemDelegate() override;
+
+  // FileSystemDelegate:
+  base::FilePath GetDefaultDirectory() override;
+  bool ShowSelectFileDialog(
+      scoped_refptr<UIThreadExtensionFunction> extension_function,
+      ui::SelectFileDialog::Type type,
+      const base::FilePath& default_path,
+      const ui::SelectFileDialog::FileTypeInfo* file_types,
+      FileSystemDelegate::FilesSelectedCallback files_selected_callback,
+      base::OnceClosure file_selection_canceled_callback) override;
+  void ConfirmSensitiveDirectoryAccess(bool has_write_permission,
+                                       const base::string16& app_name,
+                                       content::WebContents* web_contents,
+                                       const base::Closure& on_accept,
+                                       const base::Closure& on_cancel) override;
+  int GetDescriptionIdForAcceptType(const std::string& accept_type) override;
+  SavedFilesServiceInterface* GetSavedFilesService(
+      content::BrowserContext* browser_context) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ShellFileSystemDelegate);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_SHELL_BROWSER_API_FILE_SYSTEM_SHELL_FILE_SYSTEM_DELEGATE_H_