Add maxDimension() to glyph

Expand the too large for atlas calculation. Considering making
a "small enough" function on glyph.

Change-Id: I113831f4182df0939110f651fb4a5921447124c1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206705
Commit-Queue: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Auto-Submit: Herb Derby <herb@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
3 files changed