One signature for creating unit tests that run on premade GrContexts

tests/PremulAlphaRoundTripTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkConfig8888.h"
@@ skipping 87 matching lines @@
     }
 }
 
 DEF_TEST(PremulAlphaRoundTrip, reporter) {
     const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
     SkSurfaceProps props(SkSurfaceProps::kLegacyFontHost_InitType);
     SkAutoTUnref<SkBaseDevice> device(SkBitmapDevice::Create(info, props));
     test_premul_alpha_roundtrip(reporter, device);
 }
 #if SK_SUPPORT_GPU
-DEF_GPUTEST_FOR_RENDERING_CONTEXTS(PremulAlphaRoundTrip_Gpu, reporter, context) {
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(PremulAlphaRoundTrip_Gpu, reporter, ctxInfo) {
     const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
     SkSurfaceProps props(SkSurfaceProps::kLegacyFontHost_InitType);
     SkAutoTUnref<SkBaseDevice> device(
-        SkGpuDevice::Create(context, SkBudgeted::kNo, info, 0, &props,
+        SkGpuDevice::Create(ctxInfo.fGrContext, SkBudgeted::kNo, info, 0, &props,
                             SkGpuDevice::kUninit_InitContents));
     test_premul_alpha_roundtrip(reporter, device);
 }
 #endif