chromium/chrome/test/data/extensions/api_test/browser_action/update/manifest.json

{
  "name": "A browser action test to verify updates to the icon and title.",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "persistent": true,
    "scripts": ["background.js"]
  },
  "browser_action": {
    "default_title": "This is the default title.",
    "default_icon": "icon.png"
  }
}