[PDF] Add font subsetting using the sfntly library.

Patch from Arthur Hsu, original CL: http://codereview.chromium.org/7513003/

Review URL: http://codereview.appspot.com/4828041

git-svn-id: http://skia.googlecode.com/svn/trunk@1957 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/config/SkUserConfig.h b/include/config/SkUserConfig.h
index 48f6379..24a971c 100644
--- a/include/config/SkUserConfig.h
+++ b/include/config/SkUserConfig.h
@@ -135,6 +135,10 @@
  */
 //#define SK_ALLOW_LARGE_PDF_SCALARS
 
+/*  Define this to provide font subsetter in PDF generation.
+ */
+//#define SK_SFNTLY_SUBSETTER "sfntly/subsetter/font_subsetter.h"
+
 /*  Define this to remove dimension checks on bitmaps. Not all blits will be
     correct yet, so this is mostly for debugging the implementation.
  */