This CL adds cclao@ and timvp@ to watch for vulkan CLs so they can be
notified for reviews.

Bug: None
Change-Id: Iea55a95aa2037ae5c141665dfa494c809a5befa2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2152946Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Tim Van Patten <timvp@google.com>