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

{
  "name": "A page action with no icon that makes the page red",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"],
    "persistent": true
  },
  "permissions": [
    "tabs", "http://*/*"
  ],
  "page_action": {
      "default_title": "Make this page red",
      "default_icon": "icon.png"
  }
}