Switch to standard integer types in gpu/.

gpu/command_buffer/common/gles2_cmd_format.cc

 // Copyright (c) 2009 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.
 
 // This file contains the binary format definition of the command buffer and
 // command buffer commands.
 
 // We explicitly do NOT include gles2_cmd_format.h here because client side
 // and service side have different requirements.
 #include "gpu/command_buffer/common/cmd_buffer_common.h"
 
 namespace gpu {
 namespace gles2 {
 
+#include <stddef.h>
+
 #include "gpu/command_buffer/common/gles2_cmd_ids_autogen.h"
 
 const char* GetCommandName(CommandId id) {
   static const char* const names[] = {
   #define GLES2_CMD_OP(name) "k" # name,
 
   GLES2_COMMAND_LIST(GLES2_CMD_OP)
 
   #undef GLES2_CMD_OP
   };
 
   size_t index = static_cast<size_t>(id) - kStartPoint - 1;
   return (index < arraysize(names)) ?  names[index] : "*unknown-command*";
 }
 
 }  // namespace gles2
 }  // namespace gpu