Add SkSurface factory that takes an SkSurfaceCharacterization

TBR=bsalomon@google.com
Change-Id: Ie38123dc7c35005bfe8500bf4a16e0d16bbf36bd
Reviewed-on: https://skia-review.googlesource.com/117236
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
6 files changed