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glslang_test is only built in a Vulkan build. Since it doesn't build, it
prevents us from having Vulkan as part of the default build.

It appears like a file was renamed at some point and the BUILD.gn wasn't
updated to reflect this change since it wasn't being tested in the
default build.

This CL includes the newly renamed file and allows glslang_test to be
built and run again.

BUG=852196

Change-Id: I11507bd51996caed6280501f36556e17334bb1ba
Reviewed-on: https://chromium-review.googlesource.com/1098379Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Chris Blume <cblume@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566685}