Move thread_pool.h into utils so it can be shared by more than one example.

native_client_sdk/src/libraries/sdk_util/thread_pool.cc

 // 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.
 
-#include "threadpool.h"
+#include "sdk_util/thread_pool.h"
 
 #include <pthread.h>
 #include <semaphore.h>
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "utils/auto_lock.h"
+#include "sdk_util/auto_lock.h"
 
 // Initializes mutex, semaphores and a pool of threads.  If 0 is passed for
 // num_threads, all work will be performed on the dispatch thread.
 ThreadPool::ThreadPool(int num_threads)
     : threads_(NULL), counter_(0), num_threads_(num_threads), exiting_(false),
       user_data_(NULL), user_work_function_(NULL) {
   if (num_threads_ > 0) {
     int status;
     status = sem_init(&work_sem_, 0, 0);
     if (-1 == status) {
@@ skipping 112 matching lines @@
 // Dispatch() will invoke the user supplied work function across
 // one or more threads for each task.
 // Note: This function will block until all work has completed.
 void ThreadPool::Dispatch(int num_tasks, WorkFunction work, void* data) {
   if (num_threads_ > 0)
     DispatchMany(num_tasks, work, data);
   else
     DispatchHere(num_tasks, work, data);
 }