Roll Vulkan validation layers. Includes a fix for Clang call cast conversion warning. BUG=chromium:676217 Change-Id: I1b8bf8698714f4280aea52415ae5f96272a2219a Reviewed-on: https://chromium-review.googlesource.com/422440 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>