chromium/chrome/test/data/extensions/platform_apps/app_window_2/manifest.json

{
  "name": "App Window",
  "description": "A test app which opens a window.",
  "version": "1.0",
  "manifest_version": 2,
  "app": {
    "background": {
      "scripts": ["main.js"]
    }
  }
}