Begin switch to SkFontStyle for legacy calls.

include/core/SkFontStyle.h

Index: include/core/SkFontStyle.h
diff --git a/include/core/SkFontStyle.h b/include/core/SkFontStyle.h
index f42d7dd4701824b6f15666bf875c839b41216092..c18f956e94ce5733dbf755e348c7a2e7900f5877 100644
--- a/include/core/SkFontStyle.h
+++ b/include/core/SkFontStyle.h
@@ -43,8 +43,8 @@ public:
 
     SkFontStyle();
     SkFontStyle(int weight, int width, Slant);
-    /** oldStyle means the style-bits in SkTypeface::Style: bold=1, italic=2 */
-    explicit SkFontStyle(unsigned oldStyle);
+
+    static SkFontStyle FromOldStyle(unsigned oldStyle);
 
     bool operator==(const SkFontStyle& rhs) const {
         return fUnion.fU32 == rhs.fUnion.fU32;