Summary: Ref T6559. Wraps WebSocket in a reasonable driver class which does event dispatch, some state management, and handles automatic reconnect.
Test Plan: In Safari, Firefox and Chrome, connected to a websocket server and sent messages back and forth. Terminated and restarted server, saw automatic reconnects successfully reestablish a connection on all browsers.
Reviewers: btrahan, joshuaspence
Reviewed By: joshuaspence
Subscribers: epriestley
Maniphest Tasks: T6559
Differential Revision: https://secure.phabricator.com/D11252
