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

{
  "name": "chrome.sockets.tcpServer extension",
  "manifest_version": 2,
  "version": "0.1",
  "description": "end-to-end browser test for chrome.sockets.tcpServer API",
  "app": {
    "background": {
      "scripts": ["background.js"]
    }
  },
  "sockets": {
    "tcp": {
      "connect": ""
    },
    "tcpServer": {
      "listen": ""
    }
  }
}