Add WorkerPool::PostTaskAndReply and use in DHCP code.

base/threading/worker_pool.cc

Index: base/threading/worker_pool.cc
diff --git a/base/threading/worker_pool.cc b/base/threading/worker_pool.cc
new file mode 100644
index 0000000000000000000000000000000000000000..56194d2d605d017d816239472a18673a59bc23b3
--- /dev/null
+++ b/base/threading/worker_pool.cc
@@ -0,0 +1,40 @@
+// Copyright (c) 2011 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 "base/threading/worker_pool.h"
+
+#include "base/bind.h"
+#include "base/compiler_specific.h"
+#include "base/threading/post_task_and_reply_impl.h"
+#include "base/tracked_objects.h"
+
+namespace base {
+
+namespace {
+
+class PostTaskAndReplyWorkerPool : public internal::PostTaskAndReplyImpl {
+ public:
+  PostTaskAndReplyWorkerPool(bool task_is_slow) : task_is_slow_(task_is_slow) {
+  }
+
+ private:
+  virtual bool PostTask(const tracked_objects::Location& from_here,
+                        const Closure& task) OVERRIDE {
+    return WorkerPool::PostTask(from_here, task, task_is_slow_);
+  }
+
+  bool task_is_slow_;
+};
+
+}  // namespace
+
+bool WorkerPool::PostTaskAndReply(const tracked_objects::Location& from_here,
+                                  const Closure& task,
+                                  const Closure& reply,
+                                  bool task_is_slow) {
+  return PostTaskAndReplyWorkerPool(task_is_slow).PostTaskAndReply(
+      from_here, task, reply);
+}
+
+}  // namespace base