[fsp] Add an initial AsyncFileUtil.

chrome/browser/chromeos/fileapi/file_system_backend.h

 // 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>
@@ skipping 52 matching lines @@
 //
 //   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.
+  // The ownerships of |drive_delegate| and |file_system_provider_delegate| are
+  // also taken.
   FileSystemBackend(
       FileSystemBackendDelegate* drive_delegate,
+      FileSystemBackendDelegate* file_system_provider_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
@@ skipping 42 matching lines @@
   virtual void RevokeAccessForExtension(
       const std::string& extension_id) OVERRIDE;
   virtual bool GetVirtualPath(const base::FilePath& filesystem_path,
                               base::FilePath* virtual_path) OVERRIDE;
 
  private:
   scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy_;
   scoped_ptr<FileAccessPermissions> file_access_permissions_;
   scoped_ptr<fileapi::AsyncFileUtil> local_file_util_;
 
-  // The Delegate instance for the drive file system related operation.
+  // The delegate instance for the drive file system related operations.
   scoped_ptr<FileSystemBackendDelegate> drive_delegate_;
 
+  // The delegate instance for the provided file system related operations.
+  scoped_ptr<FileSystemBackendDelegate> file_system_provider_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_