chromium/third_party/blink/web_tests/external/wpt/resources/chromium/README.md

This directory contains Chromium-specific test resources, including mocks for
test-only APIs implemented with
[MojoJS](https://chromium.googlesource.com/chromium/src/+/main/mojo/public/js/README.md).

Please do **not** copy `*.mojom.m.js` into this directory. Follow this doc if you
want to add new MojoJS-backed mocks:
https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md#mojojs