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

chromecast/base/system_time_change_notifier_unittest.cc

 // Copyright 2015 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 "chromecast/base/system_time_change_notifier.h"
 
 #include <memory>
+#include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromecast {
 
 namespace {
 
 class SequencedTaskRunnerNoDelay : public base::SequencedTaskRunner {
  public:
   SequencedTaskRunnerNoDelay() {}
 
   // base::SequencedTaskRunner implementation:
   bool PostDelayedTask(const tracked_objects::Location& from_here,
-                       const base::Closure& task,
+                       base::Closure task,
                        base::TimeDelta delay) override {
-    base::ThreadTaskRunnerHandle::Get()->PostTask(from_here, task);
+    base::ThreadTaskRunnerHandle::Get()->PostTask(from_here, std::move(task));
     return true;
   }
 
   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
-                                  const base::Closure& task,
+                                  base::Closure task,
                                   base::TimeDelta delay) override {
     return true;
   }
 
   bool RunsTasksOnCurrentThread() const override { return true; }
 
  private:
   ~SequencedTaskRunnerNoDelay() override {}
 
   DISALLOW_COPY_AND_ASSIGN(SequencedTaskRunnerNoDelay);
@@ skipping 159 matching lines @@
   RunPendingTasks();
   EXPECT_EQ(0, observer_->num_time_changed());
 
   // Time change detected. Expected = now - 20 + 1, actual = now - 20.
   notifier_->set_fake_now_for_testing(now - base::TimeDelta::FromSeconds(20));
   RunPendingTasks();
   EXPECT_EQ(0, observer_->num_time_changed());
 }
 
 }  // namespace chromecast