Add logic to adjust glyph positions based on animated tracking properties.
This adjustment is applied post-shaping (it doesn't observe the text box),
and requires line re-alignment - thus it is being processed per-line.
Change-Id: Id44a295032a48c7216f126cb02dd2d2d5cc18ae3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/220076
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
