chromium/chrome/test/data/extensions/context_menus/radio_check/manifest.json

{
  "name" : "Context Menus Test Extension",
  "version" : "0.1",
  "manifest_version": 2,
  "permissions": [ "contextMenus", "tabs" ],
  "background": {
    "persistent": false,
    "scripts": ["test.js"]
  }
}