Move C effects into effects.

Change-Id: If5fb69781425260004a9782f8e92ea3d981bb0ed
Reviewed-on: https://skia-review.googlesource.com/8283
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/gn/effects.gni b/gn/effects.gni
index 10398e2..d79481f 100644
--- a/gn/effects.gni
+++ b/gn/effects.gni
@@ -8,6 +8,8 @@
 _include = get_path_info("../include", "abspath")
 
 skia_effects_sources = [
+  "$_src/c/sk_effects.cpp",
+
   "$_src/effects/GrCircleBlurFragmentProcessor.cpp",
   "$_src/effects/GrCircleBlurFragmentProcessor.h",
   "$_src/effects/GrAlphaThresholdFragmentProcessor.cpp",