Force embedding full font when serializing pictures.

include/core/SkTypeface.h

Index: include/core/SkTypeface.h
diff --git a/include/core/SkTypeface.h b/include/core/SkTypeface.h
index c3ff3641b71b4a49561dee69861361ed54d1eca4..c2aa543ab2748003f018e7f5fe4ea5019da44b38 100644
--- a/include/core/SkTypeface.h
+++ b/include/core/SkTypeface.h
@@ -137,6 +137,10 @@ public:
      */
     void serialize(SkWStream*) const;
 
+    /** Like serialize, but write the whole font (not just a signature) if possible.
+     */
+    void serializeForcingEmbedding(SkWStream*) const;
+
     /** Given the data previously written by serialize(), return a new instance
         to a typeface referring to the same font. If that font is not available,
         return null. If an instance is returned, the caller is responsible for