Toolchain: Add new proto type for uploading compiler warning logs

BUG=chromium:1077363
TEST=None

Change-Id: If5343fa67e8354a334c7f5572af548758b38442c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2181194
Tested-by: Tiancong Wang <tcwang@google.com>
Auto-Submit: Tiancong Wang <tcwang@google.com>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
4 files changed