add portable and canonical font support for DM

gm/samplerstress.cpp

Index: gm/samplerstress.cpp
diff --git a/gm/samplerstress.cpp b/gm/samplerstress.cpp
index 12f93cc785d294eda90a70f340b6e79d105be1fd..9e0843e0717bd0021a9e8d860714ebeea80405b7 100644
--- a/gm/samplerstress.cpp
+++ b/gm/samplerstress.cpp
@@ -97,6 +97,7 @@ protected:
         // stipple mask with a round rect soft clip
         SkPaint paint;
         paint.setAntiAlias(true);
+        sk_tool_utils::set_portable_typeface(&paint);
         paint.setTextSize(72);
         paint.setShader(fShader.get());
         paint.setMaskFilter(fMaskFilter.get());
@@ -123,6 +124,7 @@ protected:
         SkPaint paint2;
         paint2.setColor(SK_ColorBLACK);
         paint2.setAntiAlias(true);
+        sk_tool_utils::set_portable_typeface(&paint2);
         paint2.setTextSize(72);
         paint2.setStyle(SkPaint::kStroke_Style);
         paint2.setStrokeWidth(1);