Web MIDI: introduce MidiService class

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 "media/midi/midi_manager.h"
+
+namespace midi {
+
+MidiService::MidiService(std::unique_ptr<MidiManager> manager) {
+  base::AutoLock lock(lock_);
+  if (manager.get())
+    manager_ = std::move(manager);
+  else
+    manager_.reset(MidiManager::Create());
+}
+
+MidiService::~MidiService() {
+  base::AutoLock lock(lock_);
+  manager_.reset();
+}
+
+void MidiService::Shutdown() {
+  base::AutoLock lock(lock_);
+  manager_->Shutdown();
+}
+
+void MidiService::StartSession(MidiManagerClient* client) {
+  base::AutoLock lock(lock_);
+  manager_->StartSession(client);
+}
+
+void MidiService::EndSession(MidiManagerClient* client) {
+  base::AutoLock lock(lock_);
+  manager_->EndSession(client);
+}
+
+void MidiService::DispatchSendMidiData(MidiManagerClient* client,
+                                       uint32_t port_index,
+                                       const std::vector<uint8_t>& data,
+                                       double timestamp) {
+  base::AutoLock lock(lock_);
+  manager_->DispatchSendMidiData(client, port_index, data, timestamp);
+}
+
+}  // namespace midi