add portable and canonical font support for DM

gm/gradtext.cpp

Index: gm/gradtext.cpp
diff --git a/gm/gradtext.cpp b/gm/gradtext.cpp
index 54bf175e51af680b6225dc523f47b7535b71570c..96ce59f841e91be39f643f8f4cf19f7cee6c6fdb 100644
--- a/gm/gradtext.cpp
+++ b/gm/gradtext.cpp
@@ -47,6 +47,7 @@ protected:
     virtual SkISize onISize() { return SkISize::Make(500, 480); }
     virtual void onDraw(SkCanvas* canvas) {
         SkPaint paint;
+        sk_tool_utils::set_portable_typeface(&paint);
         SkRect r = SkRect::MakeWH(SkIntToScalar(100), SkIntToScalar(100));
 
         canvas->clipRect(r);
@@ -75,6 +76,7 @@ protected:
     virtual SkISize onISize() { return SkISize::Make(500, 480); }
     virtual void onDraw(SkCanvas* canvas) {
         SkPaint paint;
+        sk_tool_utils::set_portable_typeface(&paint);
 
         paint.setStyle(SkPaint::kFill_Style);
         canvas->drawText("Normal Fill Text", 16, 0, 50, paint);
@@ -127,6 +129,7 @@ protected:
 
     virtual void onDraw(SkCanvas* canvas) {
         SkPaint paint;
+        sk_tool_utils::set_portable_typeface(&paint);
         paint.setTextSize(SkIntToScalar(26));
 
         const SkISize& size = this->getISize();