C++11 declares a type safe null pointer

content/common/gpu/client/gl_helper_readback_support.cc

 // Copyright 2014 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 "content/common/gpu/client/gl_helper_readback_support.h"
 #include "base/logging.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "third_party/skia/include/core/SkImageInfo.h"
 
 namespace content {
@@ skipping 64 matching lines @@
   }
 
   const int kTestSize = 64;
   content::ScopedTexture dst_texture(gl_);
   ScopedTextureBinder<GL_TEXTURE_2D> texture_binder(gl_, dst_texture);
   gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   gl_->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   gl_->TexImage2D(
-      GL_TEXTURE_2D, 0, format, kTestSize, kTestSize, 0, format, type, NULL);
+      GL_TEXTURE_2D, 0, format, kTestSize, kTestSize, 0, format, type, nullptr);
   ScopedFramebuffer dst_framebuffer(gl_);
   ScopedFramebufferBinder<GL_FRAMEBUFFER> framebuffer_binder(gl_,
                                                              dst_framebuffer);
   gl_->FramebufferTexture2D(
       GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, dst_texture, 0);
   GLint format_tmp = 0, type_tmp = 0;
   gl_->GetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &format_tmp);
   gl_->GetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &type_tmp);
   *format_out = format_tmp;
   *type_out = type_tmp;
@@ skipping 78 matching lines @@
       return GLHelperReadbackSupport::NOT_SUPPORTED;
     default:
       NOTREACHED();
       break;
   }
 
   return GLHelperReadbackSupport::NOT_SUPPORTED;
 }
 
 }  // namespace content