[graphite] Check for null surface for GPU blur profile

Bug: b/427247947
Change-Id: I8075112ea21095ce14d8b77cd5807ce5656200e1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1012417
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed