Begin switch to SkFontStyle for legacy calls.

src/ports/SkFontHost_mac.cpp

Index: src/ports/SkFontHost_mac.cpp
diff --git a/src/ports/SkFontHost_mac.cpp b/src/ports/SkFontHost_mac.cpp
index 8d4a3f8cfcc0a1a39d3edd24bdcf34a1fd94fedf..4ae53f1bd266ee8e72510f548fa2c6a921a8d7d5 100644
--- a/src/ports/SkFontHost_mac.cpp
+++ b/src/ports/SkFontHost_mac.cpp
@@ -2572,10 +2572,12 @@ protected:
         return create_from_dataProvider(pr);
     }
 
-    virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
-                                               unsigned styleBits) const override {
-
-        SkFontStyle style = SkFontStyle((SkTypeface::Style)styleBits);
+#ifdef SK_VERY_LEGACY_CREATE_TYPEFACE
+    SkTypeface* onLegacyCreateTypeface(const char familyName[], unsigned styleBits) const override {
+        SkFontStyle style = SkFontStyle::FromOldStyle(styleBits);
+#else
+    SkTypeface* onLegacyCreateTypeface(const char familyName[], SkFontStyle style) const override {
+#endif
         if (familyName) {
             familyName = map_css_names(familyName);
         }