sksl support for static ifs & switches

Bug: skia:
Change-Id: Ic9e01a3a18efddb19bab26e92bfb473cad294fc1
Reviewed-on: https://skia-review.googlesource.com/16144
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
diff --git a/gn/tests.gni b/gn/tests.gni
index a0343f5..f486629 100644
--- a/gn/tests.gni
+++ b/gn/tests.gni
@@ -217,6 +217,7 @@
   "$_tests/SkSLErrorTest.cpp",
   "$_tests/SkSLGLSLTest.cpp",
   "$_tests/SkSLMemoryLayoutTest.cpp",
+  "$_tests/SkSLSPIRVTest.cpp",
   "$_tests/SortTest.cpp",
   "$_tests/SpecialImageTest.cpp",
   "$_tests/SpecialSurfaceTest.cpp",