gm missed portable text in textblobshader

TBR=reed@google.com

Review URL: https://codereview.chromium.org/1263593004
diff --git a/gm/textblobshader.cpp b/gm/textblobshader.cpp
index bd5ea22..3b2a9a5 100644
--- a/gm/textblobshader.cpp
+++ b/gm/textblobshader.cpp
@@ -20,6 +20,7 @@
 public:
     TextBlobShaderGM(const char* txt) {
         SkPaint p;
+        sk_tool_utils::set_portable_typeface(&p);
         size_t txtLen = strlen(txt);
         fGlyphs.append(p.textToGlyphs(txt, txtLen, NULL));
         p.textToGlyphs(txt, txtLen, fGlyphs.begin());