Ubuntu Installation :: Unattended Upgrades And 3rd Party Repos

I have searched on the internet but didn't manage to find out how to flag 3rd party repositories in /etc/apt/sources.list.d/50unattended-upgrades. It installs all updates from the stock Ubuntu repos but none from 3rd party repositories I later added (e.g. Chromium PPA, Skype, etc.). I understand I have to manually add the lines but I'm not sure what's the format for this. How to do this? Here's how my 50unattended-upgrades file looks like:

Code:
// Automatically upgrade packages from these (origin, archive) pairs
Unattended-Upgrade::Allowed-Origins {
"Ubuntu karmic-security";
"Ubuntu karmic-updates"; };

// List of packages to not update
Unattended-Upgrade::Package-Blacklist {
//"vim";
//"libc6";
//"libc6-dev";
//"libc6-i686"; };

// Send email to this address for problems or packages upgrades. If empty or unset then no email is sent, make sure that you have a working mail setup on your system. The package 'mailx' must be installed or anything that provides /usr/bin/mail.
//Unattended-Upgrade::Mail "root@localhost";
// Automatically reboot *WITHOUT CONFIRMATION* if a
// the file /var/run/reboot-required is found after the upgrade
//Unattended-Upgrade::Automatic-Reboot "false";