[NaCl SDK] Add nacl_io and sdk_util namespaces.

native_client_sdk/src/libraries/nacl_io/kernel_object.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_OBJECT_H_
 #define LIBRARIES_NACL_IO_KERNEL_OBJECT_H_
 
 #include <pthread.h>
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "nacl_io/error.h"
 #include "nacl_io/kernel_handle.h"
 #include "nacl_io/mount.h"
 #include "nacl_io/mount_node.h"
 #include "nacl_io/path.h"
 
 #include "sdk_util/simple_lock.h"
 
+namespace nacl_io {
 
 // KernelObject provides basic functionality for threadsafe access to kernel
 // objects such as the CWD, mount points, file descriptors and file handles.
 // All Kernel locks are private to ensure the lock order.
 //
 // All calls are assumed to be a relative path.
 class KernelObject {
  public:
   typedef std::vector<ScopedKernelHandle> HandleMap_t;
   typedef std::map<std::string, ScopedMount> MountMap_t;
@@ skipping 42 matching lines @@
   // Returns parts of the absolute path for the given relative path
   Path GetAbsParts(const std::string& path);
 
 private:
   std::string cwd_;
   std::vector<int> free_fds_;
   HandleMap_t handle_map_;
   MountMap_t mounts_;
 
   // Lock to protect free_fds_ and handle_map_.
-  SimpleLock handle_lock_;
+  sdk_util::SimpleLock handle_lock_;
 
   // Lock to protect handle_map_.
-  SimpleLock mount_lock_;
+  sdk_util::SimpleLock mount_lock_;
 
   // Lock to protect cwd_.
-  SimpleLock cwd_lock_;
+  sdk_util::SimpleLock cwd_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(KernelObject);
 };
 
+}  // namespace nacl_io
+
 #endif  // LIBRARIES_NACL_IO_KERNEL_OBJECT_H_