Added an API for creating RuntimeEffects using the SkSL DSL.

Change-Id: I305016d305455e2b90fe904d8da93cf7735cc38e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/389316
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
diff --git a/gn/tests.gni b/gn/tests.gni
index 5b56c58..e5bb1e6 100644
--- a/gn/tests.gni
+++ b/gn/tests.gni
@@ -245,6 +245,7 @@
   "$_tests/SkColor4fTest.cpp",
   "$_tests/SkColorSpaceXformStepsTest.cpp",
   "$_tests/SkDOMTest.cpp",
+  "$_tests/SkDSLRuntimeEffectTest.cpp",
   "$_tests/SkFixed15Test.cpp",
   "$_tests/SkGaussFilterTest.cpp",
   "$_tests/SkGlyphBufferTest.cpp",