chromium/chrome/test/data/extensions/api_test/executescript/callback/manifest.json

{
  "version": "1.0.0.0",
  "manifest_version": 2,
  "name": "callback test",
  "description": "Test that executeScript uses the result of the evaluated script in the callback.",
  "background": {
    "scripts": ["test.js"],
    "persistent": true
  },
  "permissions": ["tabs", "http://b.com/"]
}