Style Change: NULL->nullptr

tools/PictureRenderingFlags.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef PICTURE_RENDERING_FLAGS
 #define PICTURE_RENDERING_FLAGS
 
 class SkString;
 
 namespace sk_tools {
     class PictureRenderer;
 }
 
 enum PictureTool {
     kBench_PictureTool,
     kRender_PictureTool,
 };
 
 /**
  *  Uses SkCommandLineFlags to parse the command line, and returns a PictureRenderer
  *  reflecting the flags used. Assumes that SkCommandLineFlags::Parse has
  *  been called.
  *  @param error If there is an error or warning, it will be stored in error.
  *  @param tool Which tool is being used.
  *  @return PictureRenderer A PictureRenderer with the settings specified
- *          on the command line, or NULL if the command line is invalid.
+ *          on the command line, or nullptr if the command line is invalid.
  */
 sk_tools::PictureRenderer* parseRenderer(SkString& error, PictureTool tool);
 
 #endif // PICTURE_RENDERING_FLAGS