chromium/chrome/test/data/extensions/theme_i18n/manifest.json

{
  "name": "__MSG_name__",
  "description": "__MSG_description__",
  "version": "1",
  "manifest_version": 2,
  "default_locale": "en",
  "theme": {
    "properties" : {
      "ntp_background_alignment" : "top"
    }
  }
}