[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/sdk_util/thread_safe_queue.h

 // Copyright (c) 2013 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_SDK_UTIL_THREAD_SAFE_QUEUE_H_
 #define LIBRARIES_SDK_UTIL_THREAD_SAFE_QUEUE_H_
 
 #include <pthread.h>
 
 #include <list>
 
 #include "sdk_util/auto_lock.h"
 #include "sdk_util/macros.h"
 
+namespace sdk_util {
 
 // ThreadSafeQueue
 //
 // A simple template to support multithreaded and optionally blocking access
 // to a Queue of object pointers.
 //
 template<class T> class ThreadSafeQueue {
  public:
   ThreadSafeQueue() {
     pthread_cond_init(&cond_, NULL);
@@ skipping 25 matching lines @@
     return item;
   }
 
  private:
   std::list<T*> list_;
   pthread_cond_t  cond_;
   SimpleLock lock_;
   DISALLOW_COPY_AND_ASSIGN(ThreadSafeQueue);
 };
 
+}  // namespace sdk_util
+
 #endif  // LIBRARIES_SDK_UTIL_THREAD_SAFE_QUEUE_H_