Add protos for infra/infra version_bumper

BUG=b:177902822,chromium:1776369
TEST=generate.sh

Change-Id: I32808c0fb4b7d00957d24a1842071e2a29621b9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2716082
Auto-Submit: Jack Neus <jackneus@google.com>
Reviewed-by: Julio Hurtado <juahurta@google.com>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
2 files changed