Implement application bindings
@hadess
Submitted by Bastien Nocera Assigned to Joaquim Rocha @jrocha
Link to original bug (#670907)
Description
As shown in: https://live.gnome.org/action/diff/Design/SystemSettings/Tablet#Mockups
We would need a way to tell applications: "Zoom by 10%" or "Decrease brush size by 2 points".