This directory contains part of the browser side implementation of the native file system API.
See https://wicg.github.io/native-file-system/ for the spec for this API.
//storage/browser/file_system/
contains the backend this API is built on top of, blink/renderer/modules/native_file_system
contains the renderer side implementation and blink/public/mojom/native_file_system
contains the mojom interfaces for these APIs.