Add functions for measuring cursor positioning

New functions for computing the correspondence between cursor
position and advance, respecting grapheme boundaries.

Change-Id: I620378d5f64cd74300cd43db522adeb555825dff
5 files changed
tree: 6d45fd7151ef6987bbf810642592d694473f0b3e
  1. include/
  2. libs/
  3. sample/