You might want to change this to use the |wpt run| command once that lands, although possibly you don't need the extra offordances that offers (e.g. autodownloading necessary components)

That would be great, although part of the plan was to use CIPD[1] to distribute packages, so the package downloading part of |wpt run| would need to be turned off or parameterized.

[1] https://github.com/luci/luci-go/tree/master/cipd#cipd-chrome-infrastructure-package-deployment