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

{
  "name": "Extension Action Tab Parameter Test",
  "version": "0.1",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"]
  },
  "permissions": ["activeTab"],
  "commands": {
    "toggle-feature": {
      "suggested_key": {
        "windows": "Ctrl+Shift+Y",
        "mac": "MacCtrl+Shift+Y",
        "linux": "Ctrl+Shift+Y",
        "chromeos": "Ctrl+Shift+Y",
        "default": "Ctrl+Shift+Y"
      },
      "description": "Toggle feature foo"
    }
  }
}