Log sent and received bytes in net::BidirectionalStream

net/http/bidirectional_stream.h

 // Copyright 2015 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 NET_HTTP_BIDIRECTIONAL_STREAM_H_
 #define NET_HTTP_BIDIRECTIONAL_STREAM_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
@@ skipping 184 matching lines @@
   // Timer used to buffer data received in short time-spans and send a single
   // read completion notification.
   scoped_ptr<base::Timer> timer_;
   // HttpStreamRequest used to request a BidirectionalStreamImpl. This is NULL
   // if the request has been canceled or completed.
   scoped_ptr<HttpStreamRequest> stream_request_;
   // The underlying BidirectioanlStreamImpl used for this stream. It is
   // non-NULL, if the |stream_request_| successfully finishes.
   scoped_ptr<BidirectionalStreamImpl> stream_impl_;
 
+  // Buffer used for reading.
+  scoped_refptr<IOBuffer> read_buffer_;
+  // Buffer used for writing.
+  scoped_refptr<IOBuffer> write_buffer_;
+  // Length of |write_buffer_|.
+  size_t write_buffer_len_;
+
   DISALLOW_COPY_AND_ASSIGN(BidirectionalStream);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_BIDIRECTIONAL_STREAM_H_