Add the concept of QueueEnabledVoters to blink scheduler TaskQueue

third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.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 "platform/scheduler/base/task_queue_manager.h"
 
 #include <queue>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 125 matching lines @@
   TRACE_EVENT1(tracing_category_, "TaskQueueManager::UnregisterTaskQueue",
                "queue_name", task_queue->GetName());
   DCHECK(main_thread_checker_.CalledOnValidThread());
   if (observer_)
     observer_->OnUnregisterTaskQueue(task_queue);
 
   // Add |task_queue| to |queues_to_delete_| so we can prevent it from being
   // freed while any of our structures hold hold a raw pointer to it.
   queues_to_delete_.insert(task_queue);
   queues_.erase(task_queue);
+
   selector_.RemoveQueue(task_queue.get());
 }
 
 void TaskQueueManager::UpdateWorkQueues(LazyNow lazy_now) {
   TRACE_EVENT0(disabled_by_default_tracing_category_,
                "TaskQueueManager::UpdateWorkQueues");
 
   for (TimeDomain* time_domain : time_domains_) {
     LazyNow lazy_now_in_domain = time_domain == real_time_domain_.get()
                                      ? lazy_now
@@ skipping 334 matching lines @@
                                            *work_queue->GetFrontTask());
   }
 }
 
 bool TaskQueueManager::HasImmediateWorkForTesting() const {
   return !selector_.EnabledWorkQueuesEmpty();
 }
 
 }  // namespace scheduler
 }  // namespace blink