api.proto: Add compile protos endpoint.

BUG=b:162381958
TEST=./generate.sh

Change-Id: Ic3e273372087a6397210287f87e1af46f142c03f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2708665
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: Alex Klein <saklein@chromium.org>
3 files changed