mediaview: Introduce ArcDocumentsProviderRoot.

chrome/browser/chromeos/arc/fileapi/arc_documents_provider_root.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_DOCUMENTS_PROVIDER_ROOT_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_ROOT_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+#include "base/macros.h"
+#include "storage/browser/fileapi/async_file_util.h"
+
+namespace arc {
+
+// Represents a file system root in Android Documents Provider.
+//
+// All methods must be called on the IO thread.
+class ArcDocumentsProviderRoot {
+ public:
+  using GetFileInfoCallback = storage::AsyncFileUtil::GetFileInfoCallback;
+  using ReadDirectoryCallback = storage::AsyncFileUtil::ReadDirectoryCallback;
+
+  ArcDocumentsProviderRoot(const std::string& authority,
+                           const std::string& root_document_id);
+  ~ArcDocumentsProviderRoot();
+
+  // Queries information of a file just like AsyncFileUtil.GetFileInfo().
+  void GetFileInfo(const base::FilePath& path,
+                   const GetFileInfoCallback& callback);
+
+  // Queries a list of files under a directory just like
+  // AsyncFileUtil.ReadDirectory().
+  void ReadDirectory(const base::FilePath& path,
+                     const ReadDirectoryCallback& callback);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ArcDocumentsProviderRoot);
+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_DOCUMENTS_PROVIDER_ROOT_H_