Slight improvement to QUIC version negotation debug logging.

net/quic/quic_connection.cc

 // 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.
 
 #include "net/quic/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 #include <algorithm>
 #include <iterator>
@@ skipping 391 matching lines @@
     CloseConnection(QUIC_INVALID_VERSION_NEGOTIATION_PACKET, false);
     return;
   }
 
   if (!SelectMutualVersion(packet.versions)) {
     SendConnectionCloseWithDetails(QUIC_INVALID_VERSION,
                                    "no common version found");
     return;
   }
 
-  DVLOG(1) << ENDPOINT << "negotiating version " << version();
+  DVLOG(1) << ENDPOINT
+           << "Negotiated version: " << QuicVersionToString(version());
   server_supported_versions_ = packet.versions;
   version_negotiation_state_ = NEGOTIATION_IN_PROGRESS;
   RetransmitUnackedPackets(ALL_PACKETS);
 }
 
 void QuicConnection::OnRevivedPacket() {
 }
 
 bool QuicConnection::OnUnauthenticatedPublicHeader(
     const QuicPacketPublicHeader& header) {
@@ skipping 539 matching lines @@
   }
 }
 
 void QuicConnection::SendVersionNegotiationPacket() {
   // TODO(alyssar): implement zero server state negotiation.
   pending_version_negotiation_packet_ = true;
   if (writer_->IsWriteBlocked()) {
     visitor_->OnWriteBlocked();
     return;
   }
+  DVLOG(1) << ENDPOINT << "Sending version negotiation packet: {"
+           << QuicVersionVectorToString(framer_.supported_versions()) << "}";
   scoped_ptr<QuicEncryptedPacket> version_packet(
       packet_generator_.SerializeVersionNegotiationPacket(
           framer_.supported_versions()));
   WriteResult result = writer_->WritePacket(
       version_packet->data(), version_packet->length(),
       self_address().address(), peer_address());
 
   if (result.status == WRITE_STATUS_ERROR) {
     // We can't send an error as the socket is presumably borked.
     CloseConnection(QUIC_PACKET_WRITE_ERROR, false);
@@ skipping 1017 matching lines @@
   // If we changed the generator's batch state, restore original batch state.
   if (!already_in_batch_mode_) {
     DVLOG(1) << "Leaving Batch Mode.";
     connection_->packet_generator_.FinishBatchOperations();
   }
   DCHECK_EQ(already_in_batch_mode_,
             connection_->packet_generator_.InBatchMode());
 }
 
 }  // namespace net