Cloning this repository:

git clone git://gitorious.org/motorofl/android_system_extras.git android_system_extras
cd android_system_extras

Add this repository as a remote to an existing local repository:

git remote add android_system_extras git://gitorious.org/motorofl/android_system_extras.git
git fetch android_system_extras
git checkout -b my-local-tracking-branch android_system_extras/master_or_other_branch