Make test tags configurable

This will let us skip building some tests when they don't work
and other uses of Bazel tags.

Change-Id: I0c88d383538e83b82677791820bfa4df632db9e5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/703366
Reviewed-by: Dominik Röttsches <drott@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
1 file changed