diff -r 000000000000 -r 6474c204b198 dom/filesystem/DeviceStorageFileSystem.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/filesystem/DeviceStorageFileSystem.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,70 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_DeviceStorageFileSystem_h
+#define mozilla_dom_DeviceStorageFileSystem_h
+
+#include "mozilla/dom/FileSystemBase.h"
+#include "nsString.h"
+
+class nsDOMDeviceStorage;
+
+namespace mozilla {
+namespace dom {
+
+class DeviceStorageFileSystem
+  : public FileSystemBase
+{
+public:
+  DeviceStorageFileSystem(const nsAString& aStorageType,
+                          const nsAString& aStorageName);
+
+  void
+  Init(nsDOMDeviceStorage* aDeviceStorage);
+
+  // Overrides FileSystemBase
+
+  virtual void
+  Shutdown() MOZ_OVERRIDE;
+
+  virtual nsPIDOMWindow*
+  GetWindow() const MOZ_OVERRIDE;
+
+  virtual already_AddRefed<nsIFile>
+  GetLocalFile(const nsAString& aRealPath) const MOZ_OVERRIDE;
+
+  virtual bool
+  GetRealPath(nsIDOMFile* aFile, nsAString& aRealPath) const MOZ_OVERRIDE;
+
+  virtual const nsAString&
+  GetRootName() const MOZ_OVERRIDE;
+
+  virtual bool
+  IsSafeFile(nsIFile* aFile) const MOZ_OVERRIDE;
+
+  virtual bool
+  IsSafeDirectory(Directory* aDir) const MOZ_OVERRIDE;
+private:
+  virtual
+  ~DeviceStorageFileSystem();
+
+  bool
+  LocalPathToRealPath(const nsAString& aLocalPath, nsAString& aRealPath) const;
+
+  nsString mStorageType;
+  nsString mStorageName;
+
+  // The local path of the root. Only available in the parent process.
+  // In the child process, we don't use it and its value should be empty.
+  nsString mLocalRootPath;
+  nsString mNormalizedLocalRootPath;
+  nsDOMDeviceStorage* mDeviceStorage;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_DeviceStorageFileSystem_h