[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/real_pepper_interface.h

 /* 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.
  */
 #ifndef LIBRARIES_NACL_IO_REAL_PEPPER_INTERFACE_H_
 #define LIBRARIES_NACL_IO_REAL_PEPPER_INTERFACE_H_
 
 #include <ppapi/c/ppb.h>
 #include <ppapi/c/ppb_core.h>
 #include <ppapi/c/ppb_message_loop.h>
 #include "pepper_interface.h"
 
+namespace nacl_io {
+
 // Forward declare interface classes.
 #include "nacl_io/pepper/undef_macros.h"
 #include "nacl_io/pepper/define_empty_macros.h"
 #undef BEGIN_INTERFACE
 #define BEGIN_INTERFACE(BaseClass, PPInterface, InterfaceString) \
     class Real##BaseClass;
 #include "nacl_io/pepper/all_interfaces.h"
 
 class RealPepperInterface : public PepperInterface {
  public:
@@ skipping 22 matching lines @@
 
 // Interface pointers.
 #include "nacl_io/pepper/undef_macros.h"
 #include "nacl_io/pepper/define_empty_macros.h"
 #undef BEGIN_INTERFACE
 #define BEGIN_INTERFACE(BaseClass, PPInterface, InterfaceString) \
     Real##BaseClass* BaseClass##interface_;
 #include "nacl_io/pepper/all_interfaces.h"
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_REAL_PEPPER_INTERFACE_H_