add portable and canonical font support for DM

gm/gammatext.cpp

Index: gm/gammatext.cpp
diff --git a/gm/gammatext.cpp b/gm/gammatext.cpp
index f10680e5674eb90554709d7151ce740c6618668a..b6a87f4362f5c90575b8d0aea9e04c922b02185b 100644
--- a/gm/gammatext.cpp
+++ b/gm/gammatext.cpp
@@ -26,7 +26,7 @@ static SkShader* make_heatGradient(const SkPoint pts[2]) {
 }
 
 static bool setFont(SkPaint* paint, const char name[]) {
-    SkTypeface* tf = SkTypeface::CreateFromName(name, SkTypeface::kNormal);
+    SkTypeface* tf = sk_tool_utils::portable_typeface(name, SkTypeface::kNormal);
     if (tf) {
         paint->setTypeface(tf)->unref();
         return true;