chromium/chrome/test/data/extensions/api_test/page_action/popup/manifest.json

{
  "name": "A page action with a popup that does nothing.",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"]
  },
  "permissions": [
    "tabs", "http://*/*"
  ],
  "page_action": {
      "default_title": "Popup hello world",
      "default_icon": "icon.png",
      "default_popup": "popup.html"
  }
}