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

base/test/test_simple_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/test/test_simple_task_runner.h"
 
+#include <utility>
+
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 
 namespace base {
 
 TestSimpleTaskRunner::TestSimpleTaskRunner() = default;
 
 TestSimpleTaskRunner::~TestSimpleTaskRunner() = default;
 
 bool TestSimpleTaskRunner::PostDelayedTask(
     const tracked_objects::Location& from_here,
-    const Closure& task,
+    Closure task,
     TimeDelta delay) {
   AutoLock auto_lock(lock_);
-  pending_tasks_.push_back(
-      TestPendingTask(from_here, task, TimeTicks(), delay,
-                      TestPendingTask::NESTABLE));
+  pending_tasks_.push_back(TestPendingTask(from_here, std::move(task),
+                                           TimeTicks(), delay,
+                                           TestPendingTask::NESTABLE));
   return true;
 }
 
 bool TestSimpleTaskRunner::PostNonNestableDelayedTask(
     const tracked_objects::Location& from_here,
-    const Closure& task,
+    Closure task,
     TimeDelta delay) {
   AutoLock auto_lock(lock_);
-  pending_tasks_.push_back(
-      TestPendingTask(from_here, task, TimeTicks(), delay,
-                      TestPendingTask::NON_NESTABLE));
+  pending_tasks_.push_back(TestPendingTask(from_here, std::move(task),
+                                           TimeTicks(), delay,
+                                           TestPendingTask::NON_NESTABLE));
   return true;
 }
 
 // TODO(gab): Use SequenceToken here to differentiate between tasks running in
 // the scope of this TestSimpleTaskRunner and other task runners sharing this
 // thread. http://crbug.com/631186
 bool TestSimpleTaskRunner::RunsTasksOnCurrentThread() const {
   return thread_ref_ == PlatformThread::CurrentRef();
 }
 
@@ skipping 49 matching lines @@
     std::move(task.task).Run();
 }
 
 void TestSimpleTaskRunner::RunUntilIdle() {
   while (!pending_tasks_.empty()) {
     RunPendingTasks();
   }
 }
 
 }  // namespace base