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

{
  "name": "Platform API Test: Findability Isolation",
  "manifest_version": 2,
  "version": "1.0",
  "permissions": ["webview"],
  "app": {
    "background": {
      "scripts": ["main.js"]
    }
  }
}