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/MatrixTest.cpp b/tests/MatrixTest.cpp
index 4638fe1..abc0d54 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -6,6 +6,7 @@
  * found in the LICENSE file.
  */
 #include "Test.h"
+#include "SkMath.h"
 #include "SkMatrix.h"
 #include "SkRandom.h"