This should speed up test runs on Android, which are currently much
slower than the other platforms.

Bug: angleproject:5966
Change-Id: I57890522b64d1d195ea0be56b4f68b6d54192d64
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2919888Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>