Vulkan: Add simple test to trigger issue of buffer.write tests
Vulkan: Add simple test to trigger issue of buffer.write tests

Bug: angleproject:2580
Change-Id: I08666d1c5fc7ce977e9623a09ef08645b02339f3
Reviewed-on: https://chromium-review.googlesource.com/1117913
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Commit-Queue: Luc Ferron <a2389c1bcb3ee32b089866e04e35d1a302020674@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle