Add onGetFamilyName to SkTypeface.

src/ports/SkFontHost_fontconfig.cpp

Index: src/ports/SkFontHost_fontconfig.cpp
diff --git a/src/ports/SkFontHost_fontconfig.cpp b/src/ports/SkFontHost_fontconfig.cpp
index ace705871416ceb6d0f2ab9bb4dca6f823583416..57252d0c18557bbcb2e6b9c51c5f27c64ee21078 100644
--- a/src/ports/SkFontHost_fontconfig.cpp
+++ b/src/ports/SkFontHost_fontconfig.cpp
@@ -162,6 +162,10 @@ SkStream* FontConfigTypeface::onOpenStream(int* ttcIndex) const {
     return stream;
 }
 
+void FontConfigTypeface::onGetFamilyName(SkString* familyName) const {
+    *familyName = this->getFamilyName();
+}
+
 void FontConfigTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
                                              bool* isLocalStream) const {
     desc->setFamilyName(this->getFamilyName());