[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 <[email protected]>
Reviewed-by: James Zern <[email protected]>
6 files changed