This is how I solved it
1. There is no need to add Ubuntu repositories
2. I simply recompiled gnome-shell gnome-control-center e gir1.2-goa-1.0 from LMDE repositories (I also recompiled zenity, but that should not make a difference)
How to do it (I make the example for gnome-control-center only)
open your /etc/apt/sources.list file with superuser privileges, you should find the list of repositories for binary packages. For instance for me they are
deb
http://mirror.csclub.uwaterloo.ca/linuxmint-packages/ debian main upstream import
deb
http://lmde-mirror-fr-1.wedrop.it/latest testing main contrib non-free
deb
http://lmde-mirror-fr-1.wedrop.it/latest/security testing/updates main contrib non-free
deb
http://lmde-mirror-fr-1.wedrop.it/latest/multimedia testing main non-free
copy and paste the lines below, but change deb into deb-src.
In the end you should have 8 lines 4 start with deb and 4 start with deb-src
then sudo apt-get update
What follows I do it my way, but you can choose to perform your compilation wherever you want in your filesystem
make a folder named "Sources" in your home
inside make another folder named "gnome-control-center" and open a terminal inside it
give the command:
sudo apt-get build-dep gnome-control-center
then
sudo apt-get source gnome-control-center
the last command will download the compressed sources for the package, uncompress it, patch it all automatically
then move inside the directory (in this case due to the latest version of the package) gnome-control-center-3.4.2+git20121016.29d7c0
then give the command
sudo dpkg-buildpackage -us -uc
merrily wait for the compilation to terminate
then give the commands
cd ..
sudo dpkg -i gnome-control*.deb
this will install all of the recompiled packages
log out and then back in and if you open the system settings you will notice a lot of new control panels will popup, including the gnome online access
however that panel is still not capable to allow connection to google contacts
what you have to do is, following a similar procedure, to recompile gir1.2-goa-1.0
In this case, after decompression of the sources you will find a folder named gnome-online-accounts etc. etc.
recompile inside it and then install all of the new packages generated
then gnome-online-accounts should work
plus your complete gnome settings