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

{
  "name": "Service Worker based background script",
  "version": "0.1",
  "manifest_version": 2,
  "description": "Tests launching Service Worker based background extension",
  "permissions": ["tabs"],
  "background": {"service_worker": "service_worker_background.js"}
}