Add LunarG, Inc. and Mark Lobodzinski to the CONTRIBUTORS file
and LunarG, Inc. to the AUTHORS file.

Bug: None
Change-Id: Id3f9ff2075498532280d4a652a5fffa85dd77f45
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2945696Reviewed-by: Ian Elliott <ianelliott@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Ian Elliott <ianelliott@google.com>