chromium/chrome/test/data/extensions/api_test/webrequest/test_blocking/manifest.json

{
  "name": "test_blocking",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Tests the webRequest API.",
  "permissions": ["webRequest", "webRequestBlocking", "declarativeWebRequest",
                  "tabs", "<all_urls>"],
  "background": {
    "scripts": ["test_blocking.js"],
    "persistent": true
  }
}