Add Support to Get a COM STA Task Runner from the Task Scheduler API

base/task_scheduler/task_scheduler_impl.cc

Index: base/task_scheduler/task_scheduler_impl.cc
diff --git a/base/task_scheduler/task_scheduler_impl.cc b/base/task_scheduler/task_scheduler_impl.cc
index e5c8abf716306f8602b0cde8786e10dc292f1739..7c6e19f632aaf5cf49a9082604d1104c6d7cea17 100644
--- a/base/task_scheduler/task_scheduler_impl.cc
+++ b/base/task_scheduler/task_scheduler_impl.cc
@@ -71,6 +71,14 @@ TaskSchedulerImpl::CreateSingleThreadTaskRunnerWithTraits(
       ->CreateSingleThreadTaskRunnerWithTraits(traits);
 }
 
+#if defined(OS_WIN)
+scoped_refptr<SingleThreadTaskRunner>
+TaskSchedulerImpl::CreateCOMSTATaskRunnerWithTraits(const TaskTraits& traits) {
+  return single_thread_task_runner_manager_->CreateCOMSTATaskRunnerWithTraits(
+      traits);
+}
+#endif  // defined(OS_WIN)
+
 std::vector<const HistogramBase*> TaskSchedulerImpl::GetHistograms() const {
   std::vector<const HistogramBase*> histograms;
   for (const auto& worker_pool : worker_pools_)