chromium/chrome/test/data/extensions/api_test/messaging/event_url/manifest.json

{
  "name": "event_url",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Tests messages which require permissions.",
  "permissions": ["http://a.com/"],
  "background": {
    "page": "test.html"
  }
}