chromium/chrome/test/data/extensions/api_test/printer_provider/usb_printers/manifest.json

{
  "name": "Test USB printer provider",
  "description": "Test extension for chrome.printerProvider.onUsbAccessGranted event",
  "manifest_version": 2,
  "version": "0.1",
  "app": {
    "background": {
      "scripts": ["test.js"]
    }
  },
  "permissions": [
    "printerProvider",
    "usb"
  ]
}