Add a DEF_GPUTEST() macro.

tests/ReadWriteAlphaTest.cpp

Index: tests/ReadWriteAlphaTest.cpp
diff --git a/tests/ReadWriteAlphaTest.cpp b/tests/ReadWriteAlphaTest.cpp
index fb177df8b5b6fc438b88b033cfd5e2bb208c656c..47a5f5a7c132e4fff14b054b48066bf5ce6a5b0e 100644
--- a/tests/ReadWriteAlphaTest.cpp
+++ b/tests/ReadWriteAlphaTest.cpp
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2012 Google Inc.
  *
@@ -9,14 +8,15 @@
 // This test is specific to the GPU backend.
 #if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID)
 
-#include "Test.h"
-#include "SkGpuDevice.h"
 #include "GrContextFactory.h"
+#include "SkGpuDevice.h"
+#include "Test.h"
+#include "TestClassDef.h"
 
 static const int X_SIZE = 12;
 static const int Y_SIZE = 12;
 
-static void ReadWriteAlphaTest(skiatest::Reporter* reporter, GrContextFactory* factory) {
+DEF_GPUTEST(ReadWriteAlpha, reporter, factory) {
     for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
         GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type);
         if (!GrContextFactory::IsRenderingGLContext(glType)) {
@@ -110,7 +110,4 @@ static void ReadWriteAlphaTest(skiatest::Reporter* reporter, GrContextFactory* f
     }
 }
 
-#include "TestClassDef.h"
-DEFINE_GPUTESTCLASS("ReadWriteAlpha", ReadWriteAlphaTestClass, ReadWriteAlphaTest)
-
 #endif