Roll (1/2) LVL version forward and disable VANGLE Bug: angleproject:2393 Rolling Vulkan validation code forward to HEAD of master as of 3/6/18 afternoon. Disable Vulkan from the ANGLE build until ANGLE lands in Chromium. After that second part of roll will be submitted. Change-Id: I3c98b42a0b8999e8aa26f538959d888060c2026a Reviewed-on: https://chromium-review.googlesource.com/952525 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>