Add a basic Mojo SerialService that implements GetDevices().

device/serial/serial_service_impl.cc

+// Copyright 2014 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 "device/serial/serial_service_impl.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+
+namespace device {
+
+SerialServiceImpl::SerialServiceImpl() {
+}
+
+SerialServiceImpl::~SerialServiceImpl() {
+}
+
+// static
+void SerialServiceImpl::Create(
+    mojo::InterfaceRequest<serial::SerialService> request) {
+  mojo::BindToRequest(new SerialServiceImpl(), &request);
+}
+
+// static
+void SerialServiceImpl::CreateOnMessageLoop(
+    scoped_refptr<base::MessageLoopProxy> message_loop,
+    mojo::InterfaceRequest<serial::SerialService> request) {
+  message_loop->PostTask(
+      FROM_HERE,
+      base::Bind(&SerialServiceImpl::Create, base::Passed(&request)));
+}
+
+void SerialServiceImpl::GetDevices(
+    const mojo::Callback<void(mojo::Array<serial::DeviceInfoPtr>)>& callback) {
+  if (!device_enumerator_)
+    device_enumerator_ = SerialDeviceEnumerator::Create();
+  callback.Run(device_enumerator_->GetDevices());
+}
+
+void SerialServiceImpl::OnConnectionError() {
+  delete this;
+}
+
+}  // namespace device