blurrect_compare GM: draw "masks" in white for RGBA fallback.

Change-Id: I569fd550dbdd3fcff5e879f68a919da92421513a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/242477
Auto-Submit: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed