Turn ContextInfos returned by GrContextFactory into structs.

tests/RectangleTextureTest.cpp

Index: tests/RectangleTextureTest.cpp
diff --git a/tests/RectangleTextureTest.cpp b/tests/RectangleTextureTest.cpp
index 8c3bdd6a4a55b6507d8feb61c154fae8131baa9f..2fa51e2ba22f8db4f29487f51f36ee08b764672d 100644
--- a/tests/RectangleTextureTest.cpp
+++ b/tests/RectangleTextureTest.cpp
@@ -139,8 +139,8 @@ static void test_clear(skiatest::Reporter* reporter, GrContext* context,
 }
 
 DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(RectangleTexture, reporter, ctxInfo) {
-    GrContext* context = ctxInfo.fGrContext;
-    sk_gpu_test::GLTestContext* glContext = ctxInfo.fGLContext;
+    GrContext* context = ctxInfo.grContext();
+    sk_gpu_test::GLTestContext* glContext = ctxInfo.glContext();
     static const int kWidth = 13;
     static const int kHeight = 13;