chromium/chrome/test/data/extensions/api_test/content_settings/embeddedsettingsmetric/manifest.json

{
  "name" : "Content Settings API Test Extension",
  "version" : "0.1",
  "manifest_version": 2,
  "description" : "Content Settings API Test Extension",
  "background": {
    "scripts": ["test.js"],
    "persistent": true
  },
  "permissions": [ "contentSettings" ]
}