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/PathCoverageTest.cpp b/tests/PathCoverageTest.cpp
index d9683c1..91de178 100644
--- a/tests/PathCoverageTest.cpp
+++ b/tests/PathCoverageTest.cpp
@@ -5,6 +5,7 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#include "SkMath.h"
 #include "SkPoint.h"
 #include "SkScalar.h"
 #include "Test.h"