This extends the Vulkan surface formats to include VK_FORMAT_R8G8B8A8_UNORM
as an additional preferred RGBA 32 format.

BUG=582558
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/1963983002
Cr-Commit-Position: refs/heads/master@{#393417}