converted GrBlurredEdgeFragmentProcessor to sksl

Bug: skia:
Change-Id: I028c85f692b2e54e64be301940708387014ee0c7
Reviewed-on: https://skia-review.googlesource.com/23540
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/gn/sksl.gni b/gn/sksl.gni
index a349d9b..c1b6aba 100644
--- a/gn/sksl.gni
+++ b/gn/sksl.gni
@@ -26,6 +26,7 @@
 skia_gpu_processor_sources = [
   "$_src/effects/GrAlphaThresholdFragmentProcessor.fp",
   "$_src/effects/GrCircleBlurFragmentProcessor.fp",
+  "$_src/gpu/effects/GrBlurredEdgeFragmentProcessor.fp",
   "$_src/gpu/effects/GrCircleEffect.fp",
   "$_src/gpu/effects/GrDitherEffect.fp",
   "$_src/gpu/effects/GrEllipseEffect.fp",