chromium/chrome/test/data/extensions/api_test/service_worker/worker_based_background/script_root_scope/manifest.json

{
  "name": "Service Worker-based background script",
  "version": "0.1",
  "manifest_version": 2,
  "description": "Test registering a service worker at the root scope.",
  "background": {"service_worker": "service_worker_background.js"}
}