Per mark@'s comment: https://chromium-review.googlesource.com/c/chromium/src/+/1407041/2#message-5ac2b10d2da2dab93cea457202fb2d0698506592

> Since it’s not easy to subject this to automated testing, a written test plan would be prudent here. With security impact, we should make sure that the validation steps are correct and cover the cases they should, and we should also have something we can hand to a human tester for further validation and perhaps ongoing before-release manual testing.


…create a test plan to make sure that official builds of Chrome properly verify app shim bundles.