One signature for creating unit tests that run on premade GrContexts

tests/EGLImageTest.cpp

Index: tests/EGLImageTest.cpp
diff --git a/tests/EGLImageTest.cpp b/tests/EGLImageTest.cpp
index 47dad8164ed3f2a844cf6a4498b93f21a6558f2a..12646d53dcf8add792f3b042f29af1632fb7c46f 100644
--- a/tests/EGLImageTest.cpp
+++ b/tests/EGLImageTest.cpp
@@ -81,7 +81,10 @@ static void test_copy_surface(skiatest::Reporter* reporter, GrContext* context,
     test_read_pixels(reporter, context, copy, expectedPixelValues);
 }
 
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(EGLImageTest, reporter, context0, glCtx0) {
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(EGLImageTest, reporter, ctxInfo) {
+    GrContext* context0 = ctxInfo.fGrContext;
+    sk_gpu_test::GLTestContext* glCtx0 = ctxInfo.fGLContext;
+
     // Try to create a second GL context and then check if the contexts have necessary
     // extensions to run this test.