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

{
  "name": "system.cpu test",
  "manifest_version": 2,
  "version": "1.0",
  "description": "Test system.cpu API",
  "permissions": ["system.cpu"],
  "background": {
    "scripts": ["test_cpu_api.js"],
    "persistent": false
  }
}