chromium/chrome/test/data/extensions/manifest_tests/filebrowser_valid.json

{
  "name": "test",
  "manifest_version": 2,
  "version": "1",
  "permissions": [
    "fileBrowserHandler"
  ],
  "file_browser_handlers": [
    {
      "id" : "ID",
      "default_title" : "Test",
      "default_icon" : "icon.png",
      "file_filters" : [
        "filesystem:*.html"
      ]
    }
  ]
}