Presubmit OEM check

Add presubmit check to `repo upload` that checks to see
if any OEM names are present in the CL description.

BUG=chromium:982868
TEST=presubmit unit tests

Change-Id: I9e83164b2e1e5a0e303f6b8cbc8fa410f540cf58
Reviewed-on: https://chromium-review.googlesource.com/1692080
Tested-by: Jack Neus <jackneus@google.com>
Commit-Ready: Jack Neus <jackneus@google.com>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Nick Crews <ncrews@chromium.org>
2 files changed