Turn ContextInfos returned by GrContextFactory into structs.
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1966013002

Review-Url: https://codereview.chromium.org/1966013002
diff --git a/tests/ClearTest.cpp b/tests/ClearTest.cpp
index d227cb8..64464aa 100644
--- a/tests/ClearTest.cpp
+++ b/tests/ClearTest.cpp
@@ -53,7 +53,7 @@
 }
 
 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ClearBatch, reporter, ctxInfo) {
-    GrContext* context = ctxInfo.fGrContext;
+    GrContext* context = ctxInfo.grContext();
     static const int kW = 10;
     static const int kH = 10;