chromium/extensions/test/data/sockets_udp/api/manifest.json

{
  "manifest_version": 2,
  "name": "chrome.sockets.udp",
  "version": "0.1",
  "description": "end-to-end browser test for chrome.sockets.udp API",
  "app": {
    "background": {
      "scripts": ["multicast.js", "background.js"]
    }
  },
  "sockets": {
    "udp":  {"send": "*", "bind" : "*", "multicastMembership": ""}
  }
}