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

base/task_scheduler/task_scheduler_impl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/task_scheduler/task_scheduler_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 53 matching lines @@
       traits);
 }
 
 scoped_refptr<SingleThreadTaskRunner>
 TaskSchedulerImpl::CreateSingleThreadTaskRunnerWithTraits(
     const TaskTraits& traits) {
   return single_thread_task_runner_manager_
       ->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_)
     worker_pool->GetHistograms(&histograms);
 
   return histograms;
 }
 
 int TaskSchedulerImpl::GetMaxConcurrentTasksWithTraitsDeprecated(
     const TaskTraits& traits) const {
@@ skipping 107 matching lines @@
   // in |sequence|.
   const TaskTraits traits =
       sequence->PeekTaskTraits().WithPriority(sort_key.priority());
 
   GetWorkerPoolForTraits(traits)->ReEnqueueSequence(std::move(sequence),
                                                     sort_key);
 }
 
 }  // namespace internal
 }  // namespace base