chrome/test/data/extensions/autoupdate/v2/manifest.json

{
  "description": "Extension for Auto-Update testing",
  "manifest_version": 2,
  "name": "Auto-Update Test",
  "version": "2.0",
  "background": {
    "page": "background.html"
  },
  "update_url": "http://localhost/autoupdate/manifest"
}