converted YUVEffect to SkSL

Bug: skia:
Change-Id: I1875e44417a0a583c4f35ee4d46856a34ba55245
Reviewed-on: https://skia-review.googlesource.com/88580
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/gn/sksl.gni b/gn/sksl.gni
index 1bb5771..6248e69 100644
--- a/gn/sksl.gni
+++ b/gn/sksl.gni
@@ -44,4 +44,5 @@
   "$_src/gpu/effects/GrOverdrawFragmentProcessor.fp",
   "$_src/gpu/effects/GrSimpleTextureEffect.fp",
   "$_src/gpu/effects/GrUnpremulInputFragmentProcessor.fp",
+  "$_src/gpu/effects/GrYUVtoRGBEffect.fp",
 ]