examples/ui/shadertoy/service/meta/shadertoy_service.cmx

{
    "program": {
        "binary": "bin/app"
    },
    "sandbox": {
        "features": [ "vulkan" ],
        "services": [
          "fuchsia.tracelink.Registry",
          "fuchsia.vulkan.loader.Loader"
        ]
    }
}