version_bumper: Add input fields to request proto

Decided to make version_bumper a bit more self contained rather than
a straight luciexe step for Rubik.

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

Change-Id: I95205fe8dc1d5fbddde9297125df8af2b976df38
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2718645
Auto-Submit: Jack Neus <jackneus@google.com>
Commit-Queue: George Engelbrecht <engeg@google.com>
Reviewed-by: Julio Hurtado <juahurta@google.com>
Reviewed-by: George Engelbrecht <engeg@google.com>
2 files changed