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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/samplecode/SampleShaderText.cpp b/samplecode/SampleShaderText.cpp
index cf7cf96..f13fd4e 100644
--- a/samplecode/SampleShaderText.cpp
+++ b/samplecode/SampleShaderText.cpp
@@ -50,8 +50,8 @@
 };
 
 static const GradData gGradData[] = {
-    { 2, gColors, NULL },
-    { 5, gColors, NULL },
+    { 2, gColors, nullptr },
+    { 5, gColors, nullptr },
 };
 
 static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
@@ -182,7 +182,7 @@
             ++i;
             canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth),
                               SkIntToScalar((i % testsPerCol) * rowHeight));
-            canvas->drawTextOnPath(text, textLen, path, NULL, paint);
+            canvas->drawTextOnPath(text, textLen, path, nullptr, paint);
             canvas->restore();
         }
         canvas->restore();