Convert SerialIoHandler to use buffer interfaces for I/O API methods.

extensions/browser/api/serial/serial_connection.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_SERIAL_SERIAL_CONNECTION_H_
 #define EXTENSIONS_BROWSER_API_SERIAL_SERIAL_CONNECTION_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "content/public/browser/browser_thread.h"
 #include "device/serial/serial_io_handler.h"
 #include "extensions/browser/api/api_resource.h"
 #include "extensions/browser/api/api_resource_manager.h"
 #include "extensions/common/api/serial.h"
+#include "net/base/io_buffer.h"
 
 using content::BrowserThread;
 
 namespace extensions {
 
 // Encapsulates an open serial port.
 // NOTE: Instances of this object should only be constructed on the IO thread,
 // and all methods should only be called on the IO thread unless otherwise
 // noted.
 class SerialConnection : public ApiResource,
@@ skipping 105 matching lines @@
     base::TimeDelta delay_;
   };
 
   // Handles a receive timeout.
   void OnReceiveTimeout();
 
   // Handles a send timeout.
   void OnSendTimeout();
 
   // Receives read completion notification from the |io_handler_|.
-  void OnAsyncReadComplete(const std::string& data,
-                           device::serial::ReceiveError error);
+  void OnAsyncReadComplete(int bytes_read, device::serial::ReceiveError error);
 
   // Receives write completion notification from the |io_handler_|.
   void OnAsyncWriteComplete(int bytes_sent, device::serial::SendError error);
 
   // The pathname of the serial device.
   std::string port_;
 
   // Flag indicating whether or not the connection should persist when
   // its host app is suspended.
   bool persistent_;
@@ skipping 23 matching lines @@
   SendCompleteCallback send_complete_;
 
   // Closure which will trigger a receive timeout unless cancelled. Reset on
   // initialization and after every successful Receive().
   scoped_ptr<TimeoutTask> receive_timeout_task_;
 
   // Write timeout closure. Reset on initialization and after every successful
   // Send().
   scoped_ptr<TimeoutTask> send_timeout_task_;
 
+  scoped_refptr<net::IOBuffer> receive_buffer_;
+
   // Asynchronous I/O handler.
   scoped_refptr<device::SerialIoHandler> io_handler_;
 };
 
 }  // namespace extensions
 
 namespace mojo {
 
 template <>
 class TypeConverter<device::serial::HostControlSignalsPtr,
                     extensions::core_api::serial::HostControlSignals> {
  public:
   static device::serial::HostControlSignalsPtr ConvertFrom(
       const extensions::core_api::serial::HostControlSignals& input);
 };
 
 template <>
 class TypeConverter<device::serial::ConnectionOptionsPtr,
                     extensions::core_api::serial::ConnectionOptions> {
  public:
   static device::serial::ConnectionOptionsPtr ConvertFrom(
       const extensions::core_api::serial::ConnectionOptions& input);
 };
 
 }  // namespace mojo
 
 #endif  // EXTENSIONS_BROWSER_API_SERIAL_SERIAL_CONNECTION_H_