Add onGetFamilyName to SkTypeface.

src/ports/SkFontMgr_fontconfig.cpp

Index: src/ports/SkFontMgr_fontconfig.cpp
diff --git a/src/ports/SkFontMgr_fontconfig.cpp b/src/ports/SkFontMgr_fontconfig.cpp
index b8a3fe5b0d232de1c0c21c74c6613c1965445e25..f4cae23e03fce5498207009b6af9e4f536d99eaf 100644
--- a/src/ports/SkFontMgr_fontconfig.cpp
+++ b/src/ports/SkFontMgr_fontconfig.cpp
@@ -389,6 +389,10 @@ public:
         , fIndex(ttcIndex)
     { };
 
+    virtual void onGetFamilyName(SkString* familyName) const SK_OVERRIDE {
+        familyName->reset();
+    }
+
     virtual void onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const SK_OVERRIDE {
         desc->setStyle(this->style());
         *serialize = true;
@@ -414,6 +418,10 @@ public:
     }
     mutable SkAutoFcPattern fPattern;
 
+    virtual void onGetFamilyName(SkString* familyName) const SK_OVERRIDE {
+        *familyName = get_string(fPattern, FC_FAMILY);
+    }
+
     virtual void onGetFontDescriptor(SkFontDescriptor* desc, bool* serialize) const SK_OVERRIDE {
         FCLocker lock;
         desc->setFamilyName(get_string(fPattern, FC_FAMILY));