Copy span into a SubRunAllocator

Change-Id: I8a7176a2fdc7ee4b2b89354aeb2da05dd69bc46d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/646819
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed