I agree with the last answer to the question. It doesn't support Chromecast, nor can you connect a Chromecast device to it. Having said that, when connected to an amplifier, the output quality of the WXAD-10's Burr-Brown DAC exceeds that of Chromecast.
To improve the audio quality of Chromecast, you can plug it into the optical input of a higher quality DAC. In this mode, you are using the Chromecast as a 'transport' for the WiFi signals.