scheduler: Increase work batch size to 4

components/scheduler/child/scheduler_helper.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 "components/scheduler/child/scheduler_helper.h"
 
 #include "base/time/default_tick_clock.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "components/scheduler/child/scheduler_task_runner_delegate.h"
@@ skipping 46 matching lines @@
       TaskQueueManager::PumpPolicy::AFTER_WAKEUP);
   task_queue_manager_->SetWakeupPolicy(
       QueueId::CONTROL_TASK_AFTER_WAKEUP_QUEUE,
       TaskQueueManager::WakeupPolicy::DONT_WAKE_OTHER_QUEUES);
 
   for (size_t i = 0; i < TASK_QUEUE_COUNT; i++) {
     task_queue_manager_->SetQueueName(
         i, TaskQueueIdToString(static_cast<QueueId>(i)));
   }
 
-  // TODO(skyostil): Increase this to 4 (crbug.com/444764).
-  task_queue_manager_->SetWorkBatchSize(1);
+  task_queue_manager_->SetWorkBatchSize(4);
 
   main_task_runner_->SetDefaultTaskRunner(
       task_queue_manager_->TaskRunnerForQueue(QueueId::DEFAULT_TASK_QUEUE));
 }
 
 SchedulerHelper::~SchedulerHelper() {
   Shutdown();
 }
 
 void SchedulerHelper::Shutdown() {
@@ skipping 139 matching lines @@
 }
 
 void SchedulerHelper::RemoveTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
   CheckOnValidThread();
   if (task_queue_manager_)
     task_queue_manager_->RemoveTaskObserver(task_observer);
 }
 
 }  // namespace scheduler