chromium/chrome/test/data/extensions/api_test/window_open/popup_blocking/hosted_app/manifest.json

{
  "name": "Popup blocking test",
  "version": "1",
  "manifest_version": 2,
  "description": "Popup windows should never be blocked from within a hosted app.",
  "app": {
    "urls": [
      "http://a.com/"
    ],
    "launch": {
      "web_url": "http://a.com/app.html"
    }
  }
}