Make SkMath.h less visible in public header files.



git-svn-id: http://skia.googlecode.com/svn/trunk@2340 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/BlurTest.cpp b/tests/BlurTest.cpp
index 04aef8e..cdfa8d2 100644
--- a/tests/BlurTest.cpp
+++ b/tests/BlurTest.cpp
@@ -8,6 +8,7 @@
 #include "Test.h"
 #include "SkBlurMaskFilter.h"
 #include "SkCanvas.h"
+#include "SkMath.h"
 #include "SkPaint.h"
 #include "SkRandom.h"