Added missing SK_API

BUG=
R=senorblanco@chromium.org

Review URL: https://codereview.chromium.org/25770002

git-svn-id: http://skia.googlecode.com/svn/trunk/include@11580 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/effects/SkTileImageFilter.h b/effects/SkTileImageFilter.h
index f11a75a..bee8a68 100644
--- a/effects/SkTileImageFilter.h
+++ b/effects/SkTileImageFilter.h
@@ -10,7 +10,7 @@
 
 #include "SkImageFilter.h"
 
-class SkTileImageFilter : public SkImageFilter {
+class SK_API SkTileImageFilter : public SkImageFilter {
     typedef SkImageFilter INHERITED;
 
 public: