[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/sdk_util/thread_pool.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.
 
 // Simple thread pool class
 
 #ifndef LIBRARIES_SDK_UTIL_THREAD_POOL_H_
 #define LIBRARIES_SDK_UTIL_THREAD_POOL_H_
 
 #include <pthread.h>
 #include <semaphore.h>
 
 #include "sdk_util/atomicops.h"
 
+namespace sdk_util {
+
 // typdef helper for work function
 typedef void (*WorkFunction)(int task_index, void* data);
 
 // ThreadPool is a class to manage num_threads and assign
 // them num_tasks of work at a time. Each call
 // to Dispatch(..) will block until all tasks complete.
 // If 0 is passed in for num_threads, all tasks will be
 // issued on the dispatch thread.
 
 class ThreadPool {
@@ skipping 11 matching lines @@
   void PostExitAndJoinAll();
   pthread_t* threads_;
   Atomic32 counter_;
   const int num_threads_;
   bool exiting_;
   void* user_data_;
   WorkFunction user_work_function_;
   sem_t work_sem_;
   sem_t done_sem_;
 };
+
+}  // namespace sdk_util
+
 #endif  // LIBRARIES_SDK_UTIL_THREAD_POOL_H_