chromium/chrome/test/data/extensions/api_test/keybinding/update/mk_v1/manifest.json

{
  "name": "A test for making sure media keys that get reassigned don't get 
  reinstated during update.",
  "version": "1.0",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"]
  },
  "permissions": ["activeTab"],
  "commands": {
    "test_mediakeys_update": {
      "suggested_key": {
        "default": "MediaPlayPause"
      },
      "description": "Test for mediakeys update overwrite",
      "global": true
    }
  }
}