TextStyle::matchOneAttribute compares backgrounds even if they don’t exist

Bug: skia:10432
Change-Id: I7e615de2dad82fc4a978574a4f2458e56a90e93f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/301358
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Julia Lavrova <jlavrova@google.com>
1 file changed