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

{
  "name": "OpenPopup Test",
  "version": "1",
  "manifest_version": 2,
  "description": "Apitest for chrome.browserAction.openPopup",
  "incognito": "spanning",
  "browser_action": {
      "default_popup": "popup.html"
  },
  "background": { "scripts": ["background.js"] }
}