Use GrTextureEffect::MakeTexelSubset instead of MakeSubset in SkGpuBlurUtils

Change-Id: Ia3dad5cb12c3eb9526322fa846409c935e26d01a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268303
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed