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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/src/gpu/GrSurface.cpp b/src/gpu/GrSurface.cpp
index 89cbf4a..a7be0f4 100644
--- a/src/gpu/GrSurface.cpp
+++ b/src/gpu/GrSurface.cpp
@@ -96,7 +96,7 @@
                             uint32_t pixelOpsFlags) {
     // go through context so that all necessary flushing occurs
     GrContext* context = this->getContext();
-    if (NULL == context) {
+    if (nullptr == context) {
         return false;
     }
     return context->writeSurfacePixels(this, left, top, width, height, config, buffer, rowBytes,
@@ -108,7 +108,7 @@
                            uint32_t pixelOpsFlags) {
     // go through context so that all necessary flushing occurs
     GrContext* context = this->getContext();
-    if (NULL == context) {
+    if (nullptr == context) {
         return false;
     }
     return context->readSurfacePixels(this, left, top, width, height, config, buffer,