One signature for creating unit tests that run on premade GrContexts

tests/RectangleTextureTest.cpp

 /*
  * Copyright 2015 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
 #include "GrContext.h"
@@ skipping 119 matching lines @@
         for (int y = 0; y < h/2; ++y) {
             for (int x = 0; x < w; ++x) {
                 expectedPixels.get()[y * h + x] = expectedColor1;
             }
         }
 
         test_read_pixels(reporter, context, rectangleTexture, expectedPixels.get());
     }
 }
 
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RectangleTexture, reporter, context, glContext) {
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(RectangleTexture, reporter, ctxInfo) {
+    GrContext* context = ctxInfo.fGrContext;
+    sk_gpu_test::GLTestContext* glContext = ctxInfo.fGLContext;
     static const int kWidth = 13;
     static const int kHeight = 13;
 
     GrColor pixels[kWidth * kHeight];
     for (int y = 0; y < kHeight; ++y) {
         for (int x = 0; x < kWidth; ++x) {
             pixels[y * kWidth + x] = y * kWidth + x;
         }
     }
 
@@ skipping 47 matching lines @@
 
         test_write_pixels(reporter, context, rectangleTexture);
 
         test_clear(reporter, context, rectangleTexture);
 
         GR_GL_CALL(glContext->gl(), DeleteTextures(1, &rectTexID));
     }
 }
 
 #endif