Make PendingTask move-only and pass it by value on retaining params

base/message_loop/message_pump_perftest.cc

 // Copyright 2014 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 <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/format_macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 253 matching lines @@
     do {
       for (int i = 0; i < batch_size; ++i) {
         for (int j = 0; j < tasks_per_reload; ++j) {
           queue->AddToIncomingQueue(
               FROM_HERE, base::Bind(&DoNothing), base::TimeDelta(), false);
           num_posted++;
         }
         TaskQueue loop_local_queue;
         queue->ReloadWorkQueue(&loop_local_queue);
         while (!loop_local_queue.empty()) {
-          PendingTask t = loop_local_queue.front();
+          PendingTask t = std::move(loop_local_queue.front());
           loop_local_queue.pop();
           loop.RunTask(t);
         }
       }
 
       now = base::TimeTicks::Now();
     } while (now - start < base::TimeDelta::FromSeconds(5));
     std::string trace = StringPrintf("%d_tasks_per_reload", tasks_per_reload);
     perf_test::PrintResult(
         "task",
@@ skipping 11 matching lines @@
 
 TEST_F(PostTaskTest, TenTasksPerReload) {
   Run(10000, 10);
 }
 
 TEST_F(PostTaskTest, OneHundredTasksPerReload) {
   Run(1000, 100);
 }
 
 }  // namespace base