Enable SwANGLE on ozone headless To switch ozone testing to SwANGLE we need ANGLE to be able to run vulkan/swiftshader on the ozone headless platform. Bug: chromium:1227864 Change-Id: Icb8dc8fc4b3a5bc2402be2e41334350815fdd4dd Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3027045 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>