Allow localhost to connect to websocket

Summary: Accept websocket connections from any localhost origin, in addition to the existing chrome extensions support.

Reviewed By: jknoxville

Differential Revision: D20792131

fbshipit-source-id: d3991aa375bfb4e6f492c02dfab9bf72b1f8c412

desktop/app/src/server.tsx

@@ -159,7 +159,10 @@ class Server extends EventEmitter {
         req: IncomingMessage;
         secure: boolean;
       }) => {
-        return info.origin.startsWith('chrome-extension://');
+        return (
+          info.origin.startsWith('chrome-extension://') ||
+          info.origin.startsWith('localhost:')
+        );
       },
     });
     wss.on('connection', (ws: WebSocket, message: any) => {