Make existing unit tests only run on GL contexts

tests/SpecialSurfaceTest.cpp

Index: tests/SpecialSurfaceTest.cpp
diff --git a/tests/SpecialSurfaceTest.cpp b/tests/SpecialSurfaceTest.cpp
index b55bc4eb948d14f2597a6d867c1ec0bab5d0b84e..db1aaf0038e09785665b07c7397258ef7ba8df9d 100644
--- a/tests/SpecialSurfaceTest.cpp
+++ b/tests/SpecialSurfaceTest.cpp
@@ -82,7 +82,7 @@ DEF_TEST(SpecialSurface_Raster2, reporter) {
 
 #if SK_SUPPORT_GPU
 
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialSurface_Gpu1, reporter, ctxInfo) {
+DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(SpecialSurface_Gpu1, reporter, ctxInfo) {
     GrSurfaceDesc desc;
     desc.fConfig = kSkia8888_GrPixelConfig;
     desc.fFlags  = kRenderTarget_GrSurfaceFlag;
@@ -96,7 +96,7 @@ DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialSurface_Gpu1, reporter, ctxInfo) {
 }
 
 // test the more flexible factory
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialSurface_Gpu2, reporter, ctxInfo) {
+DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(SpecialSurface_Gpu2, reporter, ctxInfo) {
     GrSurfaceDesc desc;
     desc.fConfig = kSkia8888_GrPixelConfig;
     desc.fFlags = kRenderTarget_GrSurfaceFlag;