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/tools/skiaserve/Request.cpp b/tools/skiaserve/Request.cpp
index b16c5cf..97719e2 100644
--- a/tools/skiaserve/Request.cpp
+++ b/tools/skiaserve/Request.cpp
@@ -71,7 +71,7 @@
 #if SK_SUPPORT_GPU
     GrContextFactory* factory = fContextFactory;
     GLTestContext* gl = factory->getContextInfo(GrContextFactory::kNativeGL_ContextType,
-                                            GrContextFactory::kNone_ContextOptions).fGLContext;
+                                            GrContextFactory::kNone_ContextOptions).glContext();
     gl->makeCurrent();
 #endif
     SkASSERT(fDebugCanvas);