chromium/chrome/test/data/extensions/api_test/app_process/manifest.json

{
  "name": "app_process",
  "version": "0.1",
  "manifest_version": 2,
  "description": "Tests that app URLs with the background permission are grouped into the same process.",
  "app": {
    "urls": [
      "http://localhost/extensions/api_test/app_process/path1",
      "http://localhost/extensions/api_test/app_process/path2"
    ],
    "browse_urls": [
      "http://localhost/extensions/api_test/app_process/path4"
    ],
    "launch": {
      "web_url": "http://localhost/extensions/api_test/app_process/path1/foo.html"
    }
  },
  "permissions": [
    "background"
  ]
}