Virtualize The Existence of a Scheduler Worker Thread

base/task_scheduler/scheduler_service_thread.cc

Index: base/task_scheduler/scheduler_service_thread.cc
diff --git a/base/task_scheduler/scheduler_service_thread.cc b/base/task_scheduler/scheduler_service_thread.cc
index 48c99729ae4dcdc5d09a7bb23656b189d130ff20..91a53bfcfed2dfba7a6974522ed324508d21aced 100644
--- a/base/task_scheduler/scheduler_service_thread.cc
+++ b/base/task_scheduler/scheduler_service_thread.cc
@@ -52,6 +52,10 @@ class ServiceThreadDelegate : public SchedulerWorkerThread::Delegate {
     return sleep_time < zero_delta ? zero_delta : sleep_time;
   }
 
+  bool CanDetach(SchedulerWorkerThread* worker_thread) override {
+    return false;
+  }
+
  private:
   DelayedTaskManager* const delayed_task_manager_;
 
@@ -69,7 +73,8 @@ std::unique_ptr<SchedulerServiceThread> SchedulerServiceThread::Create(
       SchedulerWorkerThread::Create(
           ThreadPriority::NORMAL,
           WrapUnique(new ServiceThreadDelegate(delayed_task_manager)),
-          task_tracker);
+          task_tracker,
+          SchedulerWorkerThread::InitialState::ALIVE);
   if (!worker_thread)
     return nullptr;