Introduce FitsInAtlas

Change-Id: I043c593f748da196abb0310bc0bc8302ca33e5af
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/250798
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2 files changed