IWYU nit in ppapi_proxy

ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc

Index: ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc b/ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc
index 4a83a0477dae4d8b150fbcf659844f2692a1b3b9..95b702827f4b6d3bc2aa747b40947304fc116160 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc
+++ b/ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.cc
@@ -1,9 +1,10 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 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 "native_client/src/shared/ppapi_proxy/command_buffer_nacl.h"
 
+#include <sys/types.h>
 #include <sys/mman.h>
 #include "gpu/command_buffer/common/logging.h"
 #include "native_client/src/shared/ppapi_proxy/plugin_globals.h"