chromium/chrome/test/data/extensions/calculator_app/app/manifest.json

{
  "name": "Calculator",
  "description": "A simple calculator.",
  "manifest_version": 2,
  "minimum_chrome_version": "23",
  "version": "1.3.3",
  "app": {"background": {"scripts": ["model.js", "view.js", "controller.js"]}},
  "icons": {
    "16": "images/icon-16x16.png",
    "128": "images/icon-128x128.png"
  }
}