Change GetLeastUnacked() to return the next packet that could be sent

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 915 matching lines @@
   // send, send an ack to raise the high water mark.
   if (!last_ack_frames_.back().missing_packets.empty() &&
       GetLeastUnacked() > *last_ack_frames_.back().missing_packets.begin()) {
     ++stop_waiting_count_;
   } else {
     stop_waiting_count_ = 0;
   }
 }
 
 QuicPacketSequenceNumber QuicConnection::GetLeastUnacked() const {
-  return sent_packet_manager_.HasUnackedPackets() ?
-      sent_packet_manager_.GetLeastUnackedSentPacket() :
-      packet_generator_.sequence_number() + 1;
+  return sent_packet_manager_.GetLeastUnacked();
 }
 
 void QuicConnection::MaybeSendInResponseToPacket() {
   if (!connected_) {
     return;
   }
   ScopedPacketBundler bundler(this, ack_queued_ ? SEND_ACK : NO_ACK);
 
   // Now that we have received an ack, we might be able to send packets which
   // are queued locally, or drain streams which are blocked.
@@ skipping 1046 matching lines @@
   }
   for (size_t i = 0; i < retransmittable_frames->frames().size(); ++i) {
     if (retransmittable_frames->frames()[i].type == CONNECTION_CLOSE_FRAME) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace net