chromium/chrome/browser/ash/dbus/README.md

This directory contains implementations of D-Bus services that are owned by
Chrome (because they depend on functionality located within `//chrome`).

Please see [Chrome OS D-Bus Usage in Chrome] for information about adding D-Bus
services.

[Chrome OS D-Bus Usage in Chrome]: https://chromium.googlesource.com/chromiumos/docs/+/main/dbus_in_chrome.md