One signature for creating unit tests that run on premade GrContexts

tests/ImageNewShaderTest.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 "SkCanvas.h"
 #include "SkImage.h"
 #include "SkShader.h"
@@ skipping 121 matching lines @@
 
 void rasterToGpu(skiatest::Reporter* reporter, GrContext* context) {
     SkImageInfo info = SkImageInfo::MakeN32Premul(5, 5);
 
     auto sourceSurface(SkSurface::MakeRaster(info));
     auto destinationSurface(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info));
 
     runShaderTest(reporter, sourceSurface.get(), destinationSurface.get(), info);
 }
 
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageNewShader_GPU, reporter, context) {
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ImageNewShader_GPU, reporter, ctxInfo) {
     //  GPU -> GPU
-    gpuToGpu(reporter, context);
+    gpuToGpu(reporter, ctxInfo.fGrContext);
 
     //  GPU -> RASTER
-    gpuToRaster(reporter, context);
+    gpuToRaster(reporter, ctxInfo.fGrContext);
 
     //  RASTER -> GPU
-    rasterToGpu(reporter, context);
+    rasterToGpu(reporter, ctxInfo.fGrContext);
 }
 
 #endif