chrome/common/extensions/docs/examples/api/fileSystemProvider/basic/manifest.json

{
  "name": "File System Provider API Extension Example",
  "version": "0.1",
  "manifest_version": 2,
  "description":
      "Demonstrate features of the API like mounting, listing directories, etc for extensions.",
  "permissions": [
    "fileSystemProvider"
  ],
  "file_system_provider_capabilities": {
    "source": "network"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}