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

{
  "name": "Platform App Test: send message to test from chrome.app.window.create callback",
  "version": "1",
  "manifest_version": 2,
  "app": {
    "background": {
      "scripts": ["test.js"]
    }
  }
}