Do a copy of your ~/.config/chromium directory to your ~/.config/google-chrome directory.

You can also do a symlink, like this:

ln -s ~/.config/chromium ~/.config/google-chrome

That will use the chromium config as the "authoritative"/"master" config directory, with chrome just looking into chromium.

It's also a wise decision to quit Chromium and/or Chrome so that you don't have any issues with config directories.