chrome/test/data/extensions/api_test/file_system/open_writable_existing/manifest.json

{
  "name": "chrome.fileSystem open writable file",
  "manifest_version": 2,
  "version": "0.1",
  "description": "Test for chrome.fileSystem.chooseFile opening writable file.",
  "app": {
    "background": {
      "scripts": ["background.js"]
    }
  },
  "permissions": [
    {"fileSystem": []}
  ]
}