Make existing unit tests only run on GL contexts

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1869503002

Review URL: https://codereview.chromium.org/1869503002
diff --git a/tests/EGLImageTest.cpp b/tests/EGLImageTest.cpp
index 12646d5..3552757 100644
--- a/tests/EGLImageTest.cpp
+++ b/tests/EGLImageTest.cpp
@@ -81,7 +81,7 @@
     test_read_pixels(reporter, context, copy, expectedPixelValues);
 }
 
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(EGLImageTest, reporter, ctxInfo) {
+DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(EGLImageTest, reporter, ctxInfo) {
     GrContext* context0 = ctxInfo.fGrContext;
     sk_gpu_test::GLTestContext* glCtx0 = ctxInfo.fGLContext;