Implement break signal for serial api.

device/serial/serial_io_handler_win.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 <windows.h>
 
 #include "device/serial/serial_io_handler_win.h"
 
 namespace device {
 
@@ skipping 373 matching lines @@
   }
   serial::ConnectionInfoPtr info(serial::ConnectionInfo::New());
   info->bitrate = SpeedConstantToBitrate(config.BaudRate);
   info->data_bits = DataBitsConstantToEnum(config.ByteSize);
   info->parity_bit = ParityBitConstantToEnum(config.Parity);
   info->stop_bits = StopBitsConstantToEnum(config.StopBits);
   info->cts_flow_control = config.fOutxCtsFlow != 0;
   return info.Pass();
 }
 
+bool SerialIoHandlerWin::SetBreak() {
+  if (!SetCommBreak(file().GetPlatformFile())) {
+    VPLOG(1) << "Failed to set break";
+    return false;
+  }
+  return true;
+}
+
+bool SerialIoHandlerWin::ClearBreak() {
+  if (!ClearCommBreak(file().GetPlatformFile())) {
+    VPLOG(1) << "Failed to clear break";
+    return false;
+  }
+  return true;
+}
+
 std::string SerialIoHandler::MaybeFixUpPortName(const std::string& port_name) {
   // For COM numbers less than 9, CreateFile is called with a string such as
   // "COM1". For numbers greater than 9, a prefix of "\\\\.\\" must be added.
   if (port_name.length() > std::string("COM9").length())
     return std::string("\\\\.\\").append(port_name);
 
   return port_name;
 }
 
 }  // namespace device