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

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