chromium/chrome/test/data/extensions/api_test/service_worker/background/manifest.json

{
  "background": {
    "page": "background.html",
    "persistent": false
  },
  "description": "Test framework for the ServiceWorkerTest.* API tests which have background pages",
  "manifest_version": 2,
  "name": "ServiceWorkerTest.*",
  "version": "1.0"
}