Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
diff --git a/gm/textblob.cpp b/gm/textblob.cpp
index 5020e7c..a382156 100644
--- a/gm/textblob.cpp
+++ b/gm/textblob.cpp
@@ -76,7 +76,7 @@
         SkPaint p;
         p.setTypeface(fTypeface);
         size_t txtLen = strlen(fText);
-        int glyphCount = p.textToGlyphs(fText, txtLen, NULL);
+        int glyphCount = p.textToGlyphs(fText, txtLen, nullptr);
 
         fGlyphs.append(glyphCount);
         p.textToGlyphs(fText, txtLen, fGlyphs.begin());