PixelRef is not a flattenable

Change-Id: Idbc64a11c29e3bffcf788ec99cf157b9c5fd0226
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/418056
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed