I can look into doing another uprev later today.  The last one (at the time that was tot) was done to fix some platform failures, without consideration to vulcan status. 

The uprev did not go smoothly.  I am getting a build error related to vulkancts: 

...
../framework/platform/surfaceless/tcuSurfacelessPlatform.cpp:113:14: error: allocating an object of abstract class type 'tcu::surfaceless::VulkanLibrary'
                return new VulkanLibrary();
                           ^
../external/vulkancts/framework/vulkan/vkPlatform.hpp:45:38: note: unimplemented pure virtual method 'getFunctionLibrary' in 'VulkanLibrary'
        virtual const tcu::FunctionLibrary&     getFunctionLibrary              (void) const = 0;

I'll keep working on it.

This is a legit error in the tcuSurfacelessPlatform.cpp definition of VulkanLibrary.   The fix (AFAIK) needs to be upstreamed before we can uprev deqp.

Fix is in deqp/master.  Uprev should be out for review today.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/68a997182f2161863af9f31f67ae9066e2357004

commit 68a997182f2161863af9f31f67ae9066e2357004
Author: Joe M. Kniss <djmk@google.com>
Date: Thu Aug 23 19:09:22 2018

media-gfx/deqp: uprev deqp for new vulkan cts

Uprev deqp to TOT, also updates associated tools (glslang, SPIRV...)

BUG= chromium:873651 
TEST=emerge-chell deqp, emerge-nyan deqp

Change-Id: I84d08841a09e5c07305cdc7df77409dd70bb4857
Reviewed-on: https://chromium-review.googlesource.com/1176297
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Joe Kniss <djmk@google.com>
Reviewed-by: Chad Versace <chadversary@chromium.org>
Reviewed-by: Joe Kniss <djmk@google.com>

[modify] https://crrev.com/68a997182f2161863af9f31f67ae9066e2357004/media-gfx/deqp/Manifest
[rename] https://crrev.com/68a997182f2161863af9f31f67ae9066e2357004/media-gfx/deqp/deqp-2018.08.15-r1.ebuild

Thanks, looks great!