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