Try 2 for Gauss filter calculation

Originally reviewed at:
https://skia-review.googlesource.com/c/skia/+/67723

Change-Id: Ie62d81f818899f3a79df888c1594d3fbccf6d414
Reviewed-on: https://skia-review.googlesource.com/69681
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/gn/tests.gni b/gn/tests.gni
index b051326..3f8283d 100644
--- a/gn/tests.gni
+++ b/gn/tests.gni
@@ -212,6 +212,7 @@
   "$_tests/SkColor4fTest.cpp",
   "$_tests/SkDOMTest.cpp",
   "$_tests/SkFixed15Test.cpp",
+  "$_tests/SkGaussFilterTest.cpp",
   "$_tests/SkImageTest.cpp",
   "$_tests/SkLiteDLTest.cpp",
   "$_tests/SkNxTest.cpp",