Chrome Version       : 57.0.2986.0 (Official Build) dev (64-bit), Ubuntu
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari:
    Firefox:
         IE:

What steps will reproduce the problem?
(1) Flash Arduino FW for WebUSB demo https://github.com/webusb/arduino into Arduino Leonardo ETH
(2) Plug Arduino
(3) Chrome shows landing page for demo device: https://webusb.github.io/arduino/demos/console/


What is the expected result?

Demo page supposed to show demo device. 

What happens instead?

demo page does not show connected device

Please provide any additional information below. Attach a screenshot if
possible.

chrome:/device-log shows: 
[09:54:22] USB device added: path=/dev/bus/usb/003/012 vendor=10755 "Unknown", product=32832 "Arduino Leonardo ETH", serial="WUART", guid=c6d9bff6-6c59-45a8-a0d6-76b4f7c690f0
NOTE: vendorID is "Unknown" to Chrome

Suspect that chrome does not show devices from "Unknown" sources. As per http://www.the-sz.com/products/usbid/index.php?v=2a03&p=&n= 2a03 is assigned to few Arduino devices.