Make SkGpuBlurUtils take SkTileMode

This is to get ready for moving all of our texture domain
implementation into GrTextureEffect.

This may cause a short term perf regression we might make GrDomainEffect
with unnecessary shader clamping.

Change-Id: I04d9c4c6999539cfd35bda07b943c3b7eb224df8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/264397
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
8 files changed