One signature for creating unit tests that run on premade GrContexts

tests/GrTextureMipMapInvalidationTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTypes.h"
 
 #if SK_SUPPORT_GPU
 
 #include "GrContext.h"
 #include "GrTexture.h"
 #include "GrTexturePriv.h"
 #include "SkCanvas.h"
 #include "SkGr.h"
 #include "SkSurface.h"
 #include "Test.h"
 
 // Tests that GrSurface::asTexture(), GrSurface::asRenderTarget(), and static upcasting of texture
 // and render targets to GrSurface all work as expected.
-DEF_GPUTEST_FOR_NULL_CONTEXT(GrTextureMipMapInvalidationTest, reporter, context) {
+DEF_GPUTEST_FOR_NULL_CONTEXT(GrTextureMipMapInvalidationTest, reporter, ctxInfo) {
+    GrContext* context = ctxInfo.fGrContext;
     GrSurfaceDesc desc;
     desc.fConfig = kSkia8888_GrPixelConfig;
     desc.fFlags = kRenderTarget_GrSurfaceFlag;
     desc.fWidth = 256;
     desc.fHeight = 256;
     desc.fSampleCnt = 0;
     GrSurface* texRT1 = context->textureProvider()->createTexture(
         desc, SkBudgeted::kNo, nullptr, 0);
     GrSurface* texRT2 = context->textureProvider()->createTexture(
         desc, SkBudgeted::kNo, nullptr, 0);
@@ skipping 21 matching lines @@
     // Invalidating the contents of the bitmap should invalidate the mipmap, but not de-allocate
     bitmap.notifyPixelsChanged();
     REPORTER_ASSERT(reporter, true == tex->texturePriv().hasMipMaps());
     REPORTER_ASSERT(reporter, true == tex->texturePriv().mipMapsAreDirty());
 
     texRT1->unref();
     texRT2->unref();
 }
 
 #endif