chromite: specify packages to run ebuild tests for.

Add property to specify the packages to run ebuild tests. This will
allow slim builders to run ebuild tests on only the packages affected by
the changes in the CQ run rather than always test all testable packages.

BUG=chromium:1102809
TEST=./generate.sh

Change-Id: I2dadcd20082fcfda1fb0be3f487e544f3c8d3bf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2284865
Reviewed-by: Alex Klein <saklein@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: Navil Perez <navil@google.com>
Tested-by: Navil Perez <navil@google.com>
2 files changed