Copy over private SKPs during SKP asset create command

Bug: skia:6850
Change-Id: Idaa92d2b4233b9f03a15d70cc185261f0090bab4
Reviewed-on: https://skia-review.googlesource.com/24404
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
1 file changed