Implement serial API for Windows.

chrome/browser/extensions/api/serial/serial_connection.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_CONNECTION_H_
 #define CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_CONNECTION_H_
 #pragma once
 
 #include <set>
 #include <string>
 
 #include "base/memory/ref_counted.h"
+#include "base/platform_file.h"
 #include "chrome/browser/extensions/api/api_resource.h"
 #include "net/base/io_buffer.h"
 
 namespace extensions {
 
 extern const char kSerialConnectionNotFoundError[];
 
 class APIResourceEventNotifier;
 
 // Encapsulates an open serial port. Platform-specific implementations are in
 // _win and _posix versions of the the .cc file.
 class SerialConnection : public APIResource {
  public:
   SerialConnection(const std::string& port,
                    APIResourceEventNotifier* event_notifier);
   virtual ~SerialConnection();
 
   bool Open();
   void Close();
 
   int Read(uint8* byte);
   int Write(scoped_refptr<net::IOBuffer> io_buffer, int byte_count);
 
+ protected:
+  // Do platform-specific work after a successful Open().
+  bool PostOpen();
+
  private:
   std::string port_;
-  int fd_;
+  base::PlatformFile file_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_CONNECTION_H_