Add new proxy-based DetermineDomainMode w/ test

split out of: https://skia-review.googlesource.com/c/8823/ (Remove GrFragmentProcessor-derived class' GrTexture-based ctors)


Change-Id: Ibf54da589710382254b416e4801d83e9f5663f44
Reviewed-on: https://skia-review.googlesource.com/10180
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/gn/tests.gni b/gn/tests.gni
index 4435112..196c86d 100644
--- a/gn/tests.gni
+++ b/gn/tests.gni
@@ -49,6 +49,7 @@
   "$_tests/DashPathEffectTest.cpp",
   "$_tests/DataRefTest.cpp",
   "$_tests/DequeTest.cpp",
+  "$_tests/DetermineDomainModeTest.cpp",
   "$_tests/DeviceLooperTest.cpp",
   "$_tests/DeviceTest.cpp",
   "$_tests/DFPathRendererTest.cpp",