chromium/chrome/test/data/extensions/api_test/browser_action_with_icon/manifest.json

{
  "name": "Browser action with icon",
  "description": "Test",
  "version": "0.1",
  "manifest_version": 2,
  "browser_action": {
    "default_title": "Hello",
    "default_icon": "icon.png"
  }
}