TaskScheduler [11] Support ExecutionMode::SINGLE_THREADED.

base/task_scheduler/scheduler_worker_thread_stack_unittest.cc

Index: base/task_scheduler/scheduler_worker_thread_stack_unittest.cc
diff --git a/base/task_scheduler/scheduler_worker_thread_stack_unittest.cc b/base/task_scheduler/scheduler_worker_thread_stack_unittest.cc
index b39243d05d81bb97d9166be923dbc7e94943a60f..504221407737ae6c0efe9f8fe452eaf840450101 100644
--- a/base/task_scheduler/scheduler_worker_thread_stack_unittest.cc
+++ b/base/task_scheduler/scheduler_worker_thread_stack_unittest.cc
@@ -22,7 +22,7 @@ namespace {
 class MockSchedulerWorkerThreadDelegate
     : public SchedulerWorkerThread::Delegate {
  public:
-  void OnMainEntry() override {}
+  void OnMainEntry(SchedulerWorkerThread* worker_thread) override {}
   scoped_refptr<Sequence> GetWork(
       SchedulerWorkerThread* worker_thread) override {
     return nullptr;