Log sent and received bytes in net::BidirectionalStream

net/http/bidirectional_stream.h

Index: net/http/bidirectional_stream.h
diff --git a/net/http/bidirectional_stream.h b/net/http/bidirectional_stream.h
index 7e6152a48f9d699b62d8853419dfdde9267e1e51..1e3e2c00556eac56df927a9c23fd744a83c2c13d 100644
--- a/net/http/bidirectional_stream.h
+++ b/net/http/bidirectional_stream.h
@@ -202,6 +202,13 @@ class NET_EXPORT BidirectionalStream
   // 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);
 };