chromium/chrome/test/data/extensions/platform_apps/web_view/download_cookie_isolation/manifest.json

{
 "name": "Platform API Test: Cookie Isolation Across Multiple webviews",
  "manifest_version": 2,
  "version": "0.0.1",
  "permissions": ["webview"],
  "app": {
    "background": {
      "scripts": [ "background.js"]
    }
  }
}