Add build API methods to generate post-F20 test artifacts

BUG=chromium:1088117
TEST=./generate.sh

Change-Id: I3f89c86d244baf4a29304255b03509a4f8e46ac2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2222717
Reviewed-by: Shuhei Takahashi <nya@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
2 files changed