cros build: Add --test option.

Add an easy way to run the tests for an ebuild.

BUG=None
TEST=cros build --test update_engine

Change-Id: Ibc79c775707c9f70d63c3b72dab5e53dd29bd302
Reviewed-on: https://chromium-review.googlesource.com/354750
Commit-Ready: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
1 file changed