It'd be nice to have support for Bazel as a ArcanistUnitTestEngine so that arc unit and arc diff run all of a workspace's tests before submitting a review to Phabricator.

Kythe current has primitive arcanist support for its Bazel-like build system. It shouldn't be too hard for me to port it specifically for Kythe, but perhaps it would make a good contribution to the Bazel repo for other projects. Thoughts?