Instrument serial API code to make testing easier.

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>
@@ skipping 11 matching lines @@
 
 // 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,
                    int bitrate,
                    APIResourceEventNotifier* event_notifier);
   virtual ~SerialConnection();
 
-  bool Open();
-  void Close();
-  void Flush();
+  virtual bool Open();
+  virtual void Close();
+  virtual void Flush();
 
-  int Read(uint8* byte);
-  int Write(scoped_refptr<net::IOBuffer> io_buffer, int byte_count);
+  virtual int Read(uint8* byte);
+  virtual 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 bitrate_;
   base::PlatformFile file_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_CONNECTION_H_