mandoline filesystem: add a sqlite3 vfs to proxy filesystem usage.

components/filesystem/directory_impl.h

 // Copyright 2015 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 COMPONENTS_FILESYSTEM_DIRECTORY_IMPL_H_
 #define COMPONENTS_FILESYSTEM_DIRECTORY_IMPL_H_
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_file.h"
 #include "base/macros.h"
@@ skipping 26 matching lines @@
   void OpenDirectory(const mojo::String& path,
                      mojo::InterfaceRequest<Directory> directory,
                      uint32_t open_flags,
                      const OpenDirectoryCallback& callback) override;
   void Rename(const mojo::String& path,
               const mojo::String& new_path,
               const RenameCallback& callback) override;
   void Delete(const mojo::String& path,
               uint32_t delete_flags,
               const DeleteCallback& callback) override;
+  void Exists(const mojo::String& path,
+              const ExistsCallback& callback) override;
+  void IsWritable(const mojo::String& path,
+                  const IsWritableCallback& callback) override;
+  void Flush(const FlushCallback& callback) override;
 
  private:
   mojo::StrongBinding<Directory> binding_;
   base::FilePath directory_path_;
   scoped_ptr<base::ScopedTempDir> temp_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryImpl);
 };
 
 }  // namespace filesystem
 
 #endif  // COMPONENTS_FILESYSTEM_DIRECTORY_IMPL_H_