Pass Callback to TaskRunner by value and consume it on invocation (1)

base/message_loop/message_loop_task_runner.cc

 // 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.
 
 #include "base/message_loop/message_loop_task_runner.h"
 
+#include <utility>
+
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/incoming_task_queue.h"
 
 namespace base {
 namespace internal {
 
 MessageLoopTaskRunner::MessageLoopTaskRunner(
     scoped_refptr<IncomingTaskQueue> incoming_queue)
     : incoming_queue_(incoming_queue), valid_thread_id_(kInvalidThreadId) {
 }
 
 void MessageLoopTaskRunner::BindToCurrentThread() {
   AutoLock lock(valid_thread_id_lock_);
   DCHECK_EQ(kInvalidThreadId, valid_thread_id_);
   valid_thread_id_ = PlatformThread::CurrentId();
 }
 
 bool MessageLoopTaskRunner::PostDelayedTask(
     const tracked_objects::Location& from_here,
-    const base::Closure& task,
+    Closure task,
     base::TimeDelta delay) {
   DCHECK(!task.is_null()) << from_here.ToString();
-  return incoming_queue_->AddToIncomingQueue(from_here, task, delay, true);
+  return incoming_queue_->AddToIncomingQueue(from_here, std::move(task), delay,
+                                             true);
 }
 
 bool MessageLoopTaskRunner::PostNonNestableDelayedTask(
     const tracked_objects::Location& from_here,
-    const base::Closure& task,
+    Closure task,
     base::TimeDelta delay) {
   DCHECK(!task.is_null()) << from_here.ToString();
-  return incoming_queue_->AddToIncomingQueue(from_here, task, delay, false);
+  return incoming_queue_->AddToIncomingQueue(from_here, std::move(task), delay,
+                                             false);
 }
 
 bool MessageLoopTaskRunner::RunsTasksOnCurrentThread() const {
   AutoLock lock(valid_thread_id_lock_);
   return valid_thread_id_ == PlatformThread::CurrentId();
 }
 
 MessageLoopTaskRunner::~MessageLoopTaskRunner() {
 }
 
 }  // namespace internal
 
 }  // namespace base