Turn ContextInfos returned by GrContextFactory into structs.

bench/nanobench.cpp

Index: bench/nanobench.cpp
diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index 7999ad5c61915bbeaa42b5983ff406dd923de51f..30eab5c3d81c9cbb24a866c2bd301ade12092e24 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -191,7 +191,7 @@ struct GPUTarget : public Target {
                                                          SkBudgeted::kNo, info,
                                                          this->config.samples, &props);
         this->gl = gGrFactory->getContextInfo(this->config.ctxType,
-                                              this->config.ctxOptions).fGLContext;
+                                              this->config.ctxOptions).glContext();
         if (!this->surface.get()) {
             return false;
         }