Comment 3 for bug 1218402

@Michael: Ken and Günter are still working on the file picker, the app activation is still not working I think

(https://code.launchpad.net/~schwann/ubuntu-system-settings/settings-pick-background-from-gallery/+merge/182854/comments/414567 is how I tested, the content-hub got released to saucy since but start the gallery with APP_ID set might still be needed)