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

{
  "name": "Tests that worker is kept alive during extension API call.",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Test service worker ref counts.",
  "background": {"service_worker": "service_worker_background.js"}
}