We used to show a single notificaiton for every print job but
this is against th UX guidelines. Since we have to lead by
example, this change adds coalescing of multiple notifications.
bug:11155212
Change-Id: I865450495e7e85bd6620c1f42aeef07d2f83a01a
Added a list of active print jobs to the main print settings
screen. Selecting a print job from there leads to a print job
settings screen with more information about the print job and
actions to change the prit job state such as cancel and restart.
bug:10935736
Change-Id: Idd6826a998309941c3d8478dafe4b039c8ca4f45
