Seperate out quad updating from atlas updating

Change-Id: I5a4bfe0b728c23df76dd7de7d57ee06e42e5641b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/262939
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed