[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/real_pepper_interface.cc

 /* 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 "nacl_io/real_pepper_interface.h"
 #include <assert.h>
 #include <stdio.h>
 
 #include <ppapi/c/pp_errors.h>
 
+namespace nacl_io {
 
 #include "nacl_io/pepper/undef_macros.h"
 #define BEGIN_INTERFACE(BaseClass, PPInterface, InterfaceString) \
     class Real##BaseClass : public BaseClass { \
      public: \
       explicit Real##BaseClass(const PPInterface* interface);
 #define END_INTERFACE(BaseClass, PPInterface) \
      private: \
       const PPInterface* interface_; \
     };
@@ skipping 108 matching lines @@
     if (!message_loop) {
       message_loop = message_loop_interface_->Create(instance_);
       result = message_loop_interface_->AttachToCurrentThread(message_loop);
       assert(result == PP_OK);
     }
   }
 
   return PP_OK;
 }
 
+}  // namespace nacl_io
+