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Some Vulkan implementations, particularly swiftshader and i915 drivers
use memdfd_create() to implement vkGetSemaphoreFdKHR() API. That syscall
was previously enabled only on ChromeOS, which was breaking swiftshader
tests when trying to enable synchronization for some images (see
http://crrev.com/c/2353413 )

Bug: 1115692
Change-Id: Id0898d6d77ad8aa5140ffe34aa7dafbc3fe19249
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354205
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797886}