[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr in src/…

cc/resources/picture_pile.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resources/picture_pile.h"
 
 #include <algorithm>
 #include <limits>
 #include <vector>
 
@@ skipping 538 matching lines @@
   if (picture->ApproximateOpCount() > kOpCountThatIsOkToAnalyze)
     return;
 
   // Make sure all of the mapped images point to the same picture.
   for (++it; it != picture_map_.end(); ++it) {
     if (it->second.GetPicture() != picture)
       return;
   }
   skia::AnalysisCanvas canvas(recorded_viewport_.width(),
                               recorded_viewport_.height());
-  picture->Raster(&canvas, NULL, Region(), 1.0f);
+  picture->Raster(&canvas, nullptr, Region(), 1.0f);
   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 }
 
 }  // namespace cc