chromium/extensions/test/data/api_test/usb/mass_storage/manifest.json

{
  "name": "Mass storage devices in chrome.usb",
  "manifest_version": 2,
  "version": "0.1",
  "description": "Mass storage devices in chrome.usb",
  "app": {
    "background": {
      "scripts": ["background.js"]
    }
  },
  "permissions": [
    "usb",
    // These are test devices emulated by the mocks enabled for the test.
    { "usbDevices": [{ "vendorId": 1, "productId": 2 },
                     { "vendorId": 5, "productId": 6 }]}
  ]
}