Flesh out SkSurfaceCharacterization

This should be it for now except for maybe a GrMipMapped field.

Change-Id: I8f20a1048eaa8cd2b5eab5f42ca58c61649f72e7
Reviewed-on: https://skia-review.googlesource.com/78440
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
4 files changed