chromium/chrome/test/data/extensions/platform_apps/file_system_test/manifest.json

{
  "name": "File System Test Extension",
  "version": "1.0",
  "manifest_version": 2,
  "description": "An extension for testing the file system API for chrome apps.",
  "app": {
    "background": {
      "scripts": [
        "background.js"
      ]
    }
  }
}