[not for review] Web MIDI: new backend to support dynamic instantiation on Windows

media/midi/midi_service.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 "media/midi/midi_service.h"
 
 #include "base/feature_list.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "media/midi/midi_manager.h"
 #include "media/midi/midi_switches.h"
 
 namespace midi {
 
 namespace {
 
 bool IsDynamicInstantiationEnabled() {
 // TODO(toyoshim): Support on all platforms. See https://crbug.com/672793.
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_WIN)
   return base::FeatureList::IsEnabled(
       features::kMidiManagerDynamicInstantiation);
 #else
   return false;
 #endif
 }
 
 }  // namespace
 
 MidiService::MidiService(void)
@@ skipping 62 matching lines @@
 }
 
 scoped_refptr<base::SingleThreadTaskRunner> MidiService::GetTaskRunner(
     size_t runner_id) {
   base::AutoLock lock(threads_lock_);
   if (threads_.size() <= runner_id)
     threads_.resize(runner_id + 1);
   if (!threads_[runner_id].get()) {
     threads_[runner_id] = base::MakeUnique<base::Thread>(
         base::StringPrintf("MidiServiceThread(%zu)", runner_id));
+#if defined(OS_WIN)
+    threads_[runner_id]->init_com_with_mta(true);
+#endif
     threads_[runner_id]->Start();
   }
   return threads_[runner_id]->task_runner();
 }
 
 }  // namespace midi