I have no idea how hard this would be, but e.g. https://chromium-review.googlesource.com/c/558201/ was a regression it likely would have caught.

Also, I've been reproducing with decent effectiveness failures that happen on Fuchsia, but then by adding delays/etc they're reproable on Linux ASan. It'd be nice to do that straight on the Fuchsia build, if it's not too much work to set up/maintain.