WILL BE MERGED Change Ownership of Sequence to the Single Thread SchedulerWorker Delegate

base/task_scheduler/scheduler_single_thread_task_runner_manager.h

 // Copyright 2017 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.
 
 #ifndef BASE_TASK_SCHEDULER_SCHEDULER_SINGLE_THREAD_TASK_RUNNER_MANAGER_H_
 #define BASE_TASK_SCHEDULER_SCHEDULER_SINGLE_THREAD_TASK_RUNNER_MANAGER_H_
 
 #include <vector>
 
+#include "base/atomicops.h"
 #include "base/base_export.h"
+#include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/task_scheduler/scheduler_lock.h"
 #include "base/task_scheduler/scheduler_worker_pool_params.h"
 #include "base/task_scheduler/task_scheduler.h"
 
 namespace base {
 
 class TaskTraits;
 class SingleThreadTaskRunner;
@@ skipping 31 matching lines @@
   const TaskScheduler::WorkerPoolIndexForTraitsCallback
       worker_pool_index_for_traits_callback_;
   TaskTracker* const task_tracker_;
   DelayedTaskManager* const delayed_task_manager_;
 
   // Synchronizes access to |workers_| and |worker_id_|.
   SchedulerLock workers_lock_;
   std::vector<scoped_refptr<SchedulerWorker>> workers_;
   int next_worker_id_ = 0;
 
+#if DCHECK_IS_ON()
+  subtle::Atomic32 workers_unregistered_during_join_ = 0;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(SchedulerSingleThreadTaskRunnerManager);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_SCHEDULER_SINGLE_THREAD_TASK_RUNNER_MANAGER_H_