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/src/effects/SkEmbossMask.cpp b/src/effects/SkEmbossMask.cpp
index dffd2be..300494b 100644
--- a/src/effects/SkEmbossMask.cpp
+++ b/src/effects/SkEmbossMask.cpp
@@ -8,6 +8,7 @@
 
 
 #include "SkEmbossMask.h"
+#include "SkMath.h"
 
 static inline int nonzero_to_one(int x) {
 #if 0