converted GrRRectBlurEffect to SkSL

Bug: skia:
Change-Id: Ifd192db07e02d69d445277a361760ce4a452f603
Reviewed-on: https://skia-review.googlesource.com/87441
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/gn/sksl.gni b/gn/sksl.gni
index 9d992d1..1bb5771 100644
--- a/gn/sksl.gni
+++ b/gn/sksl.gni
@@ -40,6 +40,7 @@
   "$_src/gpu/effects/GrMagnifierEffect.fp",
   "$_src/gpu/effects/GrPremulInputFragmentProcessor.fp",
   "$_src/gpu/effects/GrRectBlurEffect.fp",
+  "$_src/gpu/effects/GrRRectBlurEffect.fp",
   "$_src/gpu/effects/GrOverdrawFragmentProcessor.fp",
   "$_src/gpu/effects/GrSimpleTextureEffect.fp",
   "$_src/gpu/effects/GrUnpremulInputFragmentProcessor.fp",