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

base/task_scheduler/post_task.cc

Index: base/task_scheduler/post_task.cc
diff --git a/base/task_scheduler/post_task.cc b/base/task_scheduler/post_task.cc
index a1a3bc2da388177be2b607787e4ec9dd338f5f8e..ed8a4a67ff9438ddc460d11021125ba0228772fb 100644
--- a/base/task_scheduler/post_task.cc
+++ b/base/task_scheduler/post_task.cc
@@ -95,4 +95,13 @@ scoped_refptr<SingleThreadTaskRunner> CreateSingleThreadTaskRunnerWithTraits(
       traits);
 }
 
+#if defined(OS_WIN)
+scoped_refptr<SingleThreadTaskRunner> CreateCOMSTATaskRunnerWithTraits(
+    const TaskTraits& traits) {
+  DCHECK(TaskScheduler::GetInstance())
+      << "Ref. Prerequisite section of post_task.h";
+  return TaskScheduler::GetInstance()->CreateCOMSTATaskRunnerWithTraits(traits);
+}
+#endif  // defined(OS_WIN)
+
 }  // namespace base