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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/src/animator/SkDisplayMath.cpp b/src/animator/SkDisplayMath.cpp
index 7f406c1..f52cf19 100644
--- a/src/animator/SkDisplayMath.cpp
+++ b/src/animator/SkDisplayMath.cpp
@@ -131,7 +131,7 @@
 void SkDisplayMath::executeFunction(SkDisplayable* target, int index,
         SkTDArray<SkScriptValue>& parameters, SkDisplayTypes type,
         SkScriptValue* scriptValue) {
-    if (scriptValue == NULL)
+    if (scriptValue == nullptr)
         return;
     SkASSERT(target == this);
     SkScriptValue* array = parameters.begin();