Add the concept of QueueEnabledVoters to blink scheduler TaskQueue

third_party/WebKit/Source/platform/scheduler/child/idle_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 "platform/scheduler/child/idle_helper.h"
 
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "platform/scheduler/base/real_time_domain.h"
@@ skipping 48 matching lines @@
 }
 
 void IdleHelper::Shutdown() {
   if (is_shutdown_)
     return;
 
   EndIdlePeriod();
   is_shutdown_ = true;
   weak_factory_.InvalidateWeakPtrs();
   // Belt & braces, might not be needed.
-  idle_queue_->SetQueueEnabled(false);
+  idle_queue_->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
   helper_->RemoveTaskObserver(this);
 }
 
 IdleHelper::Delegate::Delegate() {}
 
 IdleHelper::Delegate::~Delegate() {}
 
 scoped_refptr<SingleThreadIdleTaskRunner> IdleHelper::IdleTaskRunner() {
   helper_->CheckOnValidThread();
   return idle_task_runner_;
@@ skipping 414 matching lines @@
     case IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED:
       return "in_long_idle_period_paused";
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace scheduler
 }  // namespace blink