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/MathTest.cpp b/tests/MathTest.cpp
index b9e21ae..7440dfd 100644
--- a/tests/MathTest.cpp
+++ b/tests/MathTest.cpp
@@ -7,6 +7,7 @@
  */
 #include "Test.h"
 #include "SkFloatingPoint.h"
+#include "SkMath.h"
 #include "SkPoint.h"
 #include "SkRandom.h"