Replace SkTypeface::Style with SkFontStyle.

Committed: https://skia.googlesource.com/skia/+/43b8b36b20ae00e2d78421c4cda1f3f922983a20

Review URL: https://codereview.chromium.org/488143002
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 5e81116..4f9379f 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -248,6 +248,7 @@
         '<(skia_include_path)/core/SkFloatBits.h',
         '<(skia_include_path)/core/SkFloatingPoint.h',
         '<(skia_include_path)/core/SkFontHost.h',
+        '<(skia_include_path)/core/SkFontStyle.h',
         '<(skia_include_path)/core/SkGraphics.h',
         '<(skia_include_path)/core/SkImage.h',
         '<(skia_include_path)/core/SkImageDecoder.h',