In QUIC version >= 38, enables random padding of size [1, 256]

net/quic/core/quic_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.
 //
 // The entity that handles framing writes for a Quic client or server.
 // Each QuicSession will have a connection associated with it.
 //
 // On the server side, the Dispatcher handles the raw reads, and hands off
 // packets via ProcessUdpPacket for framing and processing.
 //
@@ skipping 327 matching lines @@
   // indicating if the fin bit was consumed.  This does not indicate the data
   // has been sent on the wire: it may have been turned into a packet and queued
   // if the socket was unexpectedly blocked.
   // If |listener| is provided, then it will be informed once ACKs have been
   // received for all the packets written in this call.
   // The |listener| is not owned by the QuicConnection and must outlive it.
   virtual QuicConsumedData SendStreamData(
       QuicStreamId id,
       QuicIOVector iov,
       QuicStreamOffset offset,
-      bool fin,
+      StreamSendingState state,
       QuicReferenceCountedPointer<QuicAckListenerInterface> ack_listener);
 
   // Send a RST_STREAM frame to the peer.
   virtual void SendRstStream(QuicStreamId id,
                              QuicRstStreamErrorCode error,
                              QuicStreamOffset bytes_written);
 
   // Send a BLOCKED frame to the peer.
   virtual void SendBlocked(QuicStreamId id);
 
@@ skipping 722 matching lines @@
 
   // Indicates not to send or process stop waiting frames.
   bool no_stop_waiting_frames_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnection);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_QUIC_CONNECTION_H_