For Persistent sessions student project
"if the profile directory command-line option is present when the ResourceThread is instructed to exit, serialize the data contained in cookie_storage, hsts_list, and the new HTTP authorization cache, and write the serialized data in separate files inside the profile directory."
and
"perform the same serialization on shutdown for local_data in storage_thread.rs, which represents the LocalStorage API."
Source-Repo: https://github.com/servo/servo
Source-Revision: 75d99eec0ff02718f1ec8d1b6fd58fff7c2d6fb3
