Update typeface serialization style.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2030683002

Committed: https://skia.googlesource.com/skia/+/7ae1c72e593823e6e300e4199558555765bcec17
Review-Url: https://codereview.chromium.org/2030683002
diff --git a/src/ports/SkFontMgr_custom.cpp b/src/ports/SkFontMgr_custom.cpp
index a05cc9b..6588766 100644
--- a/src/ports/SkFontMgr_custom.cpp
+++ b/src/ports/SkFontMgr_custom.cpp
@@ -43,6 +43,7 @@
 
     void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const override {
         desc->setFamilyName(fFamilyName.c_str());
+        desc->setStyle(this->fontStyle());
         *isLocal = !this->isSysFont();
     }