Create GPU-less build of Skia.



git-svn-id: http://skia.googlecode.com/svn/trunk@4912 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/ReadWriteAlphaTest.cpp b/tests/ReadWriteAlphaTest.cpp
index fb818b3..6c1c912 100644
--- a/tests/ReadWriteAlphaTest.cpp
+++ b/tests/ReadWriteAlphaTest.cpp
@@ -6,6 +6,9 @@
  * found in the LICENSE file.
  */
 
+// This test is specific to the GPU backend.
+#if SK_SUPPORT_GPU
+
 #include "Test.h"
 #include "SkGpuDevice.h"
 
@@ -105,3 +108,4 @@
 #include "TestClassDef.h"
 DEFINE_GPUTESTCLASS("ReadWriteAlpha", ReadWriteAlphaTestClass, ReadWriteAlphaTest)
 
+#endif