Implementation of PostTaskAndReply() in MessageLoopProxy and BrowserThread.

base/message_loop_proxy.cc

 // Copyright (c) 2010 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/message_loop_proxy.h"
 
+#include "base/bind.h"
+
 namespace base {
 
 MessageLoopProxy::MessageLoopProxy() {
 }
 
 MessageLoopProxy::~MessageLoopProxy() {
 }
 
+bool MessageLoopProxy::PostTaskAndReply(
+    const tracked_objects::Location& from_here,
+    const Closure& task,
+    const Closure& reply) {
+  internal::PostTaskAndReplyRelay* relay =
+      new internal::PostTaskAndReplyRelay(from_here, task, reply);
+  return PostTask(from_here, base::Bind(&internal::PostTaskAndReplyRelay::Run,
+                                        base::Unretained(relay)));
+}
+
 void MessageLoopProxy::OnDestruct() const {
   delete this;
 }
 
 }  // namespace base