In particular the Debug timeout was not generous enough. Increase the
test timeout to 20 seconds in Release and 60 seconds in Debug. Increase
the batch timeout to 240 seconds in Release and 600 seconds in Debug.

Bug: angleproject:3162
Change-Id: I0bd0ea18cb5cdab005143b8deed9500d9d2e8ea1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2047415
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>