nullptr -> paint color

This feature was simply missing.

Bug: skia:10461
Change-Id: I45024e067247a8a262872882457439e2bbb957b9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299882
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
1 file changed