This is necessary for the new Vulkan implementation.

Bug: angleproject:4029
Change-Id: I07ef54145252ff102c74179361436587bb330fc7
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2055553Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>