Disable Vulkan layers in sanitized builds.
Disable Vulkan layers in sanitized builds.

This was causing very slow builds/test runs.

Bug: chromium:837166
Bug: chromium:834269
Change-Id: If2e5665455d4a8af13cbc732a65a07550ace8304
Reviewed-on: https://chromium-review.googlesource.com/1036220
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle