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

base/task_scheduler/scheduler_worker.h

Index: base/task_scheduler/scheduler_worker.h
diff --git a/base/task_scheduler/scheduler_worker.h b/base/task_scheduler/scheduler_worker.h
index 0f9bc7f345e485cc647e7091c73744f88cd8373c..497d5dd1c6daa880566a14c60ec378f766d31fce 100644
--- a/base/task_scheduler/scheduler_worker.h
+++ b/base/task_scheduler/scheduler_worker.h
@@ -85,6 +85,9 @@ class BASE_EXPORT SchedulerWorker
     // acquire a SchedulerLock because it is called within the scope of another
     // SchedulerLock.
     virtual void OnDetach() = 0;
+
+    // Called by a thread right before the main function exits.
+    virtual void OnMainExit() {}
   };
 
   enum class InitialState { ALIVE, DETACHED };