Cameyo is able to redirect USB devices through Javascript's WebUSB interface and is supported on ChromeOS. It allows redirecting non-sensitive USB devices (those which aren't blocked by the browser) such as USB printers and scanners.

To activate WebUSB redirection, configure the PowerTag !WEBUSB=1. When the session starts, you will see a "USB" button:

Click on it and select the USB device you'd like to redirect:

The device should then be redirected.

Important: the device's drivers need to be installed on the server for it to be supported.