Proto changes for remoteexec builder support.

BUG=chromium:1256966
TEST=./generate.sh

Change-Id: Ic10c1f2825a4f7f4f64b4c70b11e4bcd286c3192
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/3259748
Reviewed-by: Fumitoshi Ukai <ukai@google.com>
Reviewed-by: Greg Edelston <gredelston@google.com>
Commit-Queue: Joanna Wang <jojwang@chromium.org>
7 files changed