I tested this by adding a Google account to Ubuntu GNOME 16.10 and making sure it worked in Evolution. I then updated the gnome-online-accounts packages and made sure Evolution still worked. I rebooted and made sure Evolution still worked. I checked Evolution's mail, calendar and contacts integration with Google.
I've been using the new evolution-data-server and gnome-online-accounts in Ubuntu GNOME 17.04 for several weeks and haven't seen the Google authentication errors recently at all.
I tested this by adding a Google account to Ubuntu GNOME 16.10 and making sure it worked in Evolution. I then updated the gnome-online- accounts packages and made sure Evolution still worked. I rebooted and made sure Evolution still worked. I checked Evolution's mail, calendar and contacts integration with Google.
I've been using the new evolution- data-server and gnome-online- accounts in Ubuntu GNOME 17.04 for several weeks and haven't seen the Google authentication errors recently at all.