chromium/chrome/test/data/banners/theme-color.json

{
  "name": "Manifest test app with theme color",
  "icons": [
    {
      "src": "launcher-icon-4x.png",
      "sizes": "192x192",
      "type": "image/png"
    }
  ],
  "start_url": "theme-color.html",
  "display": "standalone",
  "theme_color": "#ace",
  "orientation": "landscape"
}