One signature for creating unit tests that run on premade GrContexts

tests/RecordReplaceDrawTest.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 123 matching lines @@
     GrRecordReplaceDraw(pic.get(), &canvas, layerCache, SkMatrix::I(), nullptr/*callback*/);
 
     int numLayers = count_instances_of_type<SkRecords::SaveLayer>(rerecord);
     if (doReplace) {
         REPORTER_ASSERT(r, 0 == numLayers);
     } else {
         REPORTER_ASSERT(r, 1 == numLayers);
     }
 }
 
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RecordReplaceDraw, r, context) {
-    test_replacements(r, context, false);
-    test_replacements(r, context, true);
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RecordReplaceDraw, r, ctxInfo) {
+    test_replacements(r, ctxInfo.fGrContext, true);
+    test_replacements(r, ctxInfo.fGrContext, false);
 }
 
 #endif