[libwebp] Add sanitizer builders

Change-Id: Ia7dd1e5ff1fc0071b158a1dad11e2280bd8f1c7e
Bug: b:185520507
Reviewed-on: https://chromium-review.googlesource.com/c/codecs/infra/+/3245859
Commit-Queue: Roberto Alanis Baez <alanisbaez@google.com>
Reviewed-by: James Zern <jzern@google.com>
6 files changed