[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/kernel_proxy.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_KERNEL_PROXY_H_
 #define LIBRARIES_NACL_IO_KERNEL_PROXY_H_
 
 #include <map>
 #include <string>
 
 #include "nacl_io/kernel_object.h"
 #include "nacl_io/mount_factory.h"
 #include "nacl_io/ostypes.h"
 #include "nacl_io/osutime.h"
 
+namespace nacl_io {
+
 class PepperInterface;
 
 // KernelProxy provide one-to-one mapping for libc kernel calls.  Calls to the
 // proxy will result in IO access to the provided Mount and MountNode objects.
 //
 // NOTE: The KernelProxy does not directly take any kernel locks, all locking
 // is done by the parent class KernelObject.  Instead, KernelProxy is
 // responsible for taking the locks of the KernelHandle, and MountNode objects.
 // For this reason, a KernelObject call should not be done while holding
 // a handle or node lock.  In addition, to ensure locking order,
@@ skipping 91 matching lines @@
 protected:
   MountFactoryMap_t factories_;
 
   int dev_;
   PepperInterface* ppapi_;
   static KernelProxy *s_instance_;
 
   DISALLOW_COPY_AND_ASSIGN(KernelProxy);
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_KERNEL_PROXY_H_