Make existing unit tests only run on GL contexts

tests/SpecialImageTest.cpp

Index: tests/SpecialImageTest.cpp
diff --git a/tests/SpecialImageTest.cpp b/tests/SpecialImageTest.cpp
index f16f5ff84c26c5d7eba653d0fe4e6d051a901c29..1c71f7563a9be3b2c59229fc74c8cd3aa2764262 100644
--- a/tests/SpecialImageTest.cpp
+++ b/tests/SpecialImageTest.cpp
@@ -203,7 +203,7 @@ static void test_texture_backed(skiatest::Reporter* reporter,
 }
 
 // Test out the SkSpecialImage::makeTextureImage entry point
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_MakeTexture, reporter, ctxInfo) {
+DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(SpecialImage_MakeTexture, reporter, ctxInfo) {
     GrContext* context = ctxInfo.fGrContext;
     SkBitmap bm = create_bm();
 
@@ -267,7 +267,7 @@ DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_MakeTexture, reporter, ctxInfo)
     }
 }
 
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, ctxInfo) {
+DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, ctxInfo) {
     GrContext* context = ctxInfo.fGrContext;
     SkBitmap bm = create_bm();