add SK_API to SkMatrix44

git-svn-id: http://skia.googlecode.com/svn/trunk@1794 2bbb7eff-a529-9590-31e7-b0007b416f81

include/utils/SkMatrix44.h

@@ -98,7 +98,7 @@ struct SkVector4 {
     }
 };
 
-class SkMatrix44 {
+class SK_API SkMatrix44 {
 public:
     SkMatrix44();
     SkMatrix44(const SkMatrix44&);