add portable and canonical font support for DM

gm/emptypath.cpp

Index: gm/emptypath.cpp
diff --git a/gm/emptypath.cpp b/gm/emptypath.cpp
index 6b9322292e3dde581b5c5bf0cd2d678385206c0f..87e1cc554e47930ce99b8606b11f6531c3012b8f 100644
--- a/gm/emptypath.cpp
+++ b/gm/emptypath.cpp
@@ -63,6 +63,7 @@ protected:
         SkPaint titlePaint;
         titlePaint.setColor(SK_ColorBLACK);
         titlePaint.setAntiAlias(true);
+        sk_tool_utils::set_portable_typeface(&titlePaint);
         titlePaint.setLCDRenderText(true);
         titlePaint.setTextSize(15 * SK_Scalar1);
         const char title[] = "Empty Paths Drawn Into Rectangle Clips With "
@@ -105,6 +106,7 @@ protected:
                 SkPaint labelPaint;
                 labelPaint.setColor(color);
                 labelPaint.setAntiAlias(true);
+                sk_tool_utils::set_portable_typeface(&labelPaint);
                 labelPaint.setLCDRenderText(true);
                 labelPaint.setTextSize(12 * SK_Scalar1);
                 canvas->drawText(gStyles[style].fName,