allow SkUserConfig.h to control NOGPU

tests/ReadWriteAlphaTest.cpp

Index: tests/ReadWriteAlphaTest.cpp
diff --git a/tests/ReadWriteAlphaTest.cpp b/tests/ReadWriteAlphaTest.cpp
index 7b6a05d29964df3995a18ac018addf860c9de9b5..7d756a7840afec79006a4c2368a8a95e273c9f14 100644
--- a/tests/ReadWriteAlphaTest.cpp
+++ b/tests/ReadWriteAlphaTest.cpp
@@ -5,13 +5,13 @@
  * found in the LICENSE file.
  */
 
-// This test is specific to the GPU backend.
-#if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID)
-
 #include "GrContextFactory.h"
 #include "SkGpuDevice.h"
 #include "Test.h"
 
+// This test is specific to the GPU backend.
+#if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID)
+
 static const int X_SIZE = 12;
 static const int Y_SIZE = 12;