Add the concept of QueueEnabledVoters to blink scheduler TaskQueue

third_party/WebKit/Source/platform/scheduler/child/scheduler_helper_unittest.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/child/scheduler_helper.h"
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/test/simple_test_tick_clock.h"
@@ skipping 198 matching lines @@
   scheduler_helper_->SetObserver(nullptr);
 }
 
 TEST_F(SchedulerHelperTest, OnTriedToExecuteBlockedTask) {
   MockObserver observer;
   scheduler_helper_->SetObserver(&observer);
 
   scoped_refptr<TaskQueue> task_queue = scheduler_helper_->NewTaskQueue(
       TaskQueue::Spec(TaskQueue::QueueType::TEST)
           .SetShouldReportWhenExecutionBlocked(true));
-  task_queue->SetQueueEnabled(false);
+  std::unique_ptr<TaskQueue::QueueEnabledVoter> voter =
+      task_queue->CreateQueueEnabledVoter();
+  voter->SetQueueEnabled(false);
   task_queue->PostTask(FROM_HERE, base::Bind(&NopTask));
 
   // Trick |task_queue| into posting a DoWork. By default PostTask with a
   // disabled queue won't post a DoWork until we enable the queue.
-  task_queue->SetQueueEnabled(true);
-  task_queue->SetQueueEnabled(false);
+  voter->SetQueueEnabled(true);
+  voter->SetQueueEnabled(false);
 
   EXPECT_CALL(observer, OnTriedToExecuteBlockedTask(_, _)).Times(1);
   RunUntilIdle();
 
   scheduler_helper_->SetObserver(nullptr);
 }
 
 }  // namespace scheduler
 }  // namespace blink