chromium/chrome/test/data/extensions/api_test/permissions/optional_retain_gesture/manifest.json

{
   "name": "permissions/optional_retain_gesture",
   "description": "permissions/optional_retain_gesture",
   "version": "0.1",
   "manifest_version": 2,
   "background": {
     "scripts": ["background.js"]
   },
   "optional_permissions": ["bookmarks"]
}