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diff --git a/chrome/browser/chromeos/fileapi/file_system_backend.h b/chrome/browser/chromeos/fileapi/file_system_backend.h
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+// Copyright 2013 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_FILEAPI_FILE_SYSTEM_BACKEND_H_
+#define CHROME_BROWSER_CHROMEOS_FILEAPI_FILE_SYSTEM_BACKEND_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/files/file_path.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
+#include "webkit/browser/fileapi/file_system_backend.h"
+#include "webkit/browser/quota/special_storage_policy.h"
+#include "webkit/browser/webkit_storage_browser_export.h"
+#include "webkit/common/fileapi/file_system_types.h"
+
+namespace fileapi {
+class AsyncFileUtilAdapter;
+class CopyOrMoveFileValidatorFactory;
+class ExternalMountPoints;
+class FileSystemFileUtil;
+class FileSystemURL;
+class IsolatedContext;
+}
+
+namespace chromeos {
+
+class FileSystemBackendDelegate;
+class FileAccessPermissions;
+
+// FileSystemBackend is a Chrome OS specific implementation of
+// ExternalFileSystemBackend. This class is responsible for a
+// number of things, including:
+//
+// - Add system mount points
+// - Grant/revoke/check file access permissions
+// - Create FileSystemOperation per file system type
+// - Create FileStreamReader/Writer per file system type
+//
+// Chrome OS specific mount points:
+//
+// "Downloads" is a mount point for user's Downloads directory on the local
+// disk, where downloaded files are stored by default.
+//
+// "archive" is a mount point for an archive file, such as a zip file. This
+// mount point exposes contents of an archive file via cros_disks and AVFS
+// <http://avf.sourceforge.net/>.
+//
+// "removable" is a mount point for removable media such as an SD card.
+// Insertion and removal of removable media are handled by cros_disks.
+//
+// "oem" is a read-only mount point for a directory containing OEM data.
+//
+// "drive" is a mount point for Google Drive. Drive is integrated with the
+// FileSystem API layer via drive::FileSystemProxy. This mount point is added
+// by drive::DriveIntegrationService.
+//
+// These mount points are placed under the "external" namespace, and file
+// system URLs for these mount points look like:
+//
+//   filesystem:<origin>/external/<mount_name>/...
+//
+class FileSystemBackend : public fileapi::ExternalFileSystemBackend {
+ public:
+  using fileapi::FileSystemBackend::OpenFileSystemCallback;
+
+  // FileSystemBackend will take an ownership of a |mount_points|
+  // reference. On the other hand, |system_mount_points| will be kept as a raw
+  // pointer and it should outlive FileSystemBackend instance.
+  // The ownership of |drive_delegate| is also taken.
+  FileSystemBackend(
+      FileSystemBackendDelegate* drive_delegate,
+      scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy,
+      scoped_refptr<fileapi::ExternalMountPoints> mount_points,
+      fileapi::ExternalMountPoints* system_mount_points);
+  virtual ~FileSystemBackend();
+
+  // Adds system mount points, such as "archive", and "removable". This
+  // function is no-op if these mount points are already present.
+  void AddSystemMountPoints();
+
+  // Returns true if CrosMountpointProvider can handle |url|, i.e. its
+  // file system type matches with what this provider supports.
+  // This could be called on any threads.
+  static bool CanHandleURL(const fileapi::FileSystemURL& url);
+
+  // fileapi::FileSystemBackend overrides.
+  virtual bool CanHandleType(fileapi::FileSystemType type) const OVERRIDE;
+  virtual void OpenFileSystem(
+      const GURL& origin_url,
+      fileapi::FileSystemType type,
+      fileapi::OpenFileSystemMode mode,
+      const OpenFileSystemCallback& callback) OVERRIDE;
+  virtual fileapi::FileSystemFileUtil* GetFileUtil(
+      fileapi::FileSystemType type) OVERRIDE;
+  virtual fileapi::AsyncFileUtil* GetAsyncFileUtil(
+      fileapi::FileSystemType type) OVERRIDE;
+  virtual fileapi::CopyOrMoveFileValidatorFactory*
+      GetCopyOrMoveFileValidatorFactory(
+          fileapi::FileSystemType type,
+          base::PlatformFileError* error_code) OVERRIDE;
+  virtual fileapi::FileSystemOperation* CreateFileSystemOperation(
+      const fileapi::FileSystemURL& url,
+      fileapi::FileSystemContext* context,
+      base::PlatformFileError* error_code) const OVERRIDE;
+  virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
+      const fileapi::FileSystemURL& path,
+      int64 offset,
+      const base::Time& expected_modification_time,
+      fileapi::FileSystemContext* context) const OVERRIDE;
+  virtual scoped_ptr<fileapi::FileStreamWriter> CreateFileStreamWriter(
+      const fileapi::FileSystemURL& url,
+      int64 offset,
+      fileapi::FileSystemContext* context) const OVERRIDE;
+  virtual fileapi::FileSystemQuotaUtil* GetQuotaUtil() OVERRIDE;
+
+  // fileapi::ExternalFileSystemBackend overrides.
+  virtual bool IsAccessAllowed(const fileapi::FileSystemURL& url)
+      const OVERRIDE;
+  virtual std::vector<base::FilePath> GetRootDirectories() const OVERRIDE;
+  virtual void GrantFullAccessToExtension(
+      const std::string& extension_id) OVERRIDE;
+  virtual void GrantFileAccessToExtension(
+      const std::string& extension_id,
+      const base::FilePath& virtual_path) OVERRIDE;
+  virtual void RevokeAccessForExtension(
+      const std::string& extension_id) OVERRIDE;
+  virtual bool GetVirtualPath(const base::FilePath& filesystem_path,
+                              base::FilePath* virtual_path) OVERRIDE;
+
+ private:
+  base::FilePath GetFileSystemRootPath(const fileapi::FileSystemURL& url) const;
+
+  scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy_;
+  scoped_ptr<FileAccessPermissions> file_access_permissions_;
+  scoped_ptr<fileapi::AsyncFileUtilAdapter> local_file_util_;
+
+  // The Delegate instance for the drive file system related operation.
+  scoped_ptr<FileSystemBackendDelegate> drive_delegate_;
+
+  // Mount points specific to the owning context (i.e. per-profile mount
+  // points).
+  //
+  // It is legal to have mount points with the same name as in
+  // system_mount_points_. Also, mount point paths may overlap with mount point
+  // paths in system_mount_points_. In both cases mount points in
+  // |mount_points_| will have a priority.
+  // E.g. if |mount_points_| map 'foo1' to '/foo/foo1' and
+  // |file_system_mount_points_| map 'xxx' to '/foo/foo1/xxx', |GetVirtualPaths|
+  // will resolve '/foo/foo1/xxx/yyy' as 'foo1/xxx/yyy' (i.e. the mapping from
+  // |mount_points_| will be used).
+  scoped_refptr<fileapi::ExternalMountPoints> mount_points_;
+
+  // Globally visible mount points. System MountPonts instance should outlive
+  // all FileSystemBackend instances, so raw pointer is safe.
+  fileapi::ExternalMountPoints* system_mount_points_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileSystemBackend);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILEAPI_FILE_SYSTEM_BACKEND_H_