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

base/task_scheduler/scheduler_single_thread_task_runner_manager.h

Index: base/task_scheduler/scheduler_single_thread_task_runner_manager.h
diff --git a/base/task_scheduler/scheduler_single_thread_task_runner_manager.h b/base/task_scheduler/scheduler_single_thread_task_runner_manager.h
index 3b0ffd4fbf6726be7724459408437c8a6d0cd241..6fbad4bb1d0e7ef5a64a843a65c4118c48899b63 100644
--- a/base/task_scheduler/scheduler_single_thread_task_runner_manager.h
+++ b/base/task_scheduler/scheduler_single_thread_task_runner_manager.h
@@ -7,7 +7,9 @@
 
 #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"
@@ -59,6 +61,10 @@ class BASE_EXPORT SchedulerSingleThreadTaskRunnerManager final {
   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);
 };