chrome/test/data/web_apps/simple/manifest.json

{
  "name": "Simple web app",
  "icons": [
    {
      "src": "basic-48.png",
      "sizes": "48x48",
      "type": "image/png"
    },
    {
      "src": "basic-192.png",
      "sizes": "192x192",
      "type": "image/png"
    }
  ],
  "start_url": "index.html",
  "display": "standalone",
  "scope": "."
}