chromium/chrome/test/data/extensions/api_test/keybinding/synthesized/manifest.json

{
  "name": "A browser action with no command, should get synthesized command",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"]
  },
  "browser_action": {
    "default_title": "browser action"
  },
  "commands": {
    "unrelated-feature": {
      "suggested_key": {
        "mac": "MacCtrl+Shift+Y",
        "default": "Ctrl+Shift+Y"
      },
      "description": "Toggle feature foo"
    }
  }
}