fix dstreadshuffle text portable gm

TBR=reed@google.com

Review URL: https://codereview.chromium.org/1259093004
diff --git a/gm/dstreadshuffle.cpp b/gm/dstreadshuffle.cpp
index 798f040..8cdccbc 100644
--- a/gm/dstreadshuffle.cpp
+++ b/gm/dstreadshuffle.cpp
@@ -87,6 +87,7 @@
             case kText_ShapeType: {
                 const char* text = "Hello!";
                 paint->setTextSize(30);
+                sk_tool_utils::set_portable_typeface(paint);
                 canvas->drawText(text, strlen(text), 0, 0, *paint);
             }
             default: