Add a partial Mojo serial connection interface and implementation.

device/serial/serial_io_handler_win.cc

Index: device/serial/serial_io_handler_win.cc
diff --git a/device/serial/serial_io_handler_win.cc b/device/serial/serial_io_handler_win.cc
index 275a18988e530de50edf874623be0d29e9ddb799..1ab4f88aa81fb1501d1f719d167448b23d920ded 100644
--- a/device/serial/serial_io_handler_win.cc
+++ b/device/serial/serial_io_handler_win.cc
@@ -133,8 +133,9 @@ serial::StopBits StopBitsConstantToEnum(int stop_bits) {
 }  // namespace
 
 // static
-scoped_refptr<SerialIoHandler> SerialIoHandler::Create() {
-  return new SerialIoHandlerWin();
+scoped_refptr<SerialIoHandler> SerialIoHandler::Create(
+    scoped_refptr<base::MessageLoopProxy> file_thread_message_loop) {
+  return new SerialIoHandlerWin(file_thread_message_loop);
 }
 
 bool SerialIoHandlerWin::PostOpen() {
@@ -237,8 +238,11 @@ void SerialIoHandlerWin::CancelWriteImpl() {
   ::CancelIo(file().GetPlatformFile());
 }
 
-SerialIoHandlerWin::SerialIoHandlerWin()
-    : event_mask_(0), is_comm_pending_(false) {
+SerialIoHandlerWin::SerialIoHandlerWin(
+    scoped_refptr<base::MessageLoopProxy> file_thread_message_loop)
+    : SerialIoHandler(file_thread_message_loop),
+      event_mask_(0),
+      is_comm_pending_(false) {
 }
 
 SerialIoHandlerWin::~SerialIoHandlerWin() {