minijail: Pass gid option through libminijailpreload.

BUG=chromium-os:19495
TEST=Examined the changed gid of a process launched via minijail_run.

Change-Id: I069295be964db508a8d7bfb00d2fee4244c49f60
Reviewed-on: http://gerrit.chromium.org/gerrit/6510
Reviewed-by: Elly Jones <ellyjones@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
1 file changed