Style Change: NULL->nullptr

tests/SkImageTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkImagePriv.h"
 #include "Test.h"
@@ skipping 15 matching lines @@
         canvas.drawIRect(r, p);
         SkBitmap dstBitmap;
         srcBitmap.extractSubset(&dstBitmap, r);
         image.reset(SkImage::NewFromBitmap(dstBitmap));
     }
 
     SkBitmap tgt;
     tgt.allocN32Pixels(gWidth, gHeight);
     SkCanvas canvas(tgt);
     canvas.clear(SK_ColorTRANSPARENT);
-    canvas.drawImage(image, 0, 0, NULL);
+    canvas.drawImage(image, 0, 0, nullptr);
 
     uint32_t pixel = 0;
     SkImageInfo info = SkImageInfo::Make(1, 1, kBGRA_8888_SkColorType, kUnpremul_SkAlphaType);
     canvas.readPixels(info, &pixel, 4, 0, 0);
     REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
     canvas.readPixels(info, &pixel, 4, gWidth - 6, gWidth - 6);
     REPORTER_ASSERT(reporter, pixel == SK_ColorGREEN);
 
     canvas.readPixels(info, &pixel, 4, gWidth - 5, gWidth - 5);
     REPORTER_ASSERT(reporter, pixel == SK_ColorTRANSPARENT);
 }