This package provides commands for increasing or decreasing the
default font size in all GUI Emacs frames -- it is like an
Emacs-wide version of `text-scale-mode'.

Usage:

Enable the global minor mode `default-text-scale-mode' to bind
C-M-= and C-M-- to `default-text-scale-increase' and
`default-text-scale-decrease' respectively.  Alternatively, bind
those commands directly in another map.