We have webexposed tests to prevent unintentional changes to the JavaScript APIs exposed to windows and workers. These are reviewed by API owners to ensure any changes are appropriate. See:
https://cs.chromium.org/chromium/src/third_party/WebKit/LayoutTests/virtual/stable/webexposed/OWNERS

The safeguard of such webexposed tests is missing for worklets. There are some webexposed tests:
https://cs.chromium.org/chromium/src/third_party/WebKit/LayoutTests/http/tests/worklet/webexposed/

However, these do not have any special OWNERS setup to ensure review.

We should add webexposed tests for all the worklet types (e.g. Paint, Animation, Audio, Layout), with a restricted OWNERS file for the stable expectations files.

Ideally, there would be some trigger to add webexposed tests if a new type of worklet is added.