Turn ContextInfos returned by GrContextFactory into structs.

tests/VkWrapTests.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This is a GPU-backend specific test. It relies on static intializers to work
 
 #include "SkTypes.h"
@@ skipping 141 matching lines @@
     // check adopt creation
     backendCopy.fAlloc = backendTex->fAlloc;
     tex = gpu->wrapBackendTexture(desc, kAdopt_GrWrapOwnership);
     REPORTER_ASSERT(reporter, tex);
     tex->unref();
 
     gpu->deleteTestingOnlyBackendTexture(backendObj, true);
 }
 
 DEF_GPUTEST_FOR_VULKAN_CONTEXT(VkWrapTests, reporter, ctxInfo) {
-    wrap_tex_test(reporter, ctxInfo.fGrContext);
-    wrap_rt_test(reporter, ctxInfo.fGrContext);
-    wrap_trt_test(reporter, ctxInfo.fGrContext);
+    wrap_tex_test(reporter, ctxInfo.grContext());
+    wrap_rt_test(reporter, ctxInfo.grContext());
+    wrap_trt_test(reporter, ctxInfo.grContext());
 }
 
 #endif