chromium/chrome/test/data/extensions/desktop_capture/manifest.json

{
  "manifest_version": 2,
  "name": "Basic Desktop Capture",
  "version": "0.1",
  "description": "Allows WebRTC screensharing.",
  "background": {
    "scripts": ["background.js"]
  },
  "content_scripts": [{
        "js": ["content.js"],
        "matches": [
          "<all_urls>"
        ],
        "run_at": "document_start"
  }],
  "permissions": [
      "desktopCapture"
  ]
}