Allow receiving a QUIC CongestionFeedbackFrame that is not kTCP.

net/quic/congestion_control/tcp_cubic_sender.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/congestion_control/tcp_cubic_sender.h"
 
 #include <algorithm>
 
 #include "base/metrics/histogram.h"
 #include "net/quic/congestion_control/rtt_stats.h"
@@ skipping 50 matching lines @@
   if (is_server && config.HasReceivedInitialCongestionWindow()) {
     // Set the initial window size.
     congestion_window_ = min(kMaxInitialWindow,
                              config.ReceivedInitialCongestionWindow());
   }
 }
 
 void TcpCubicSender::OnIncomingQuicCongestionFeedbackFrame(
     const QuicCongestionFeedbackFrame& feedback,
     QuicTime feedback_receive_time) {
-  receive_window_ = feedback.tcp.receive_window;
+  if (feedback.type == kTCP) {
+    receive_window_ = feedback.tcp.receive_window;
+  }
 }
 
 void TcpCubicSender::OnCongestionEvent(
     bool rtt_updated,
     QuicByteCount bytes_in_flight,
     const CongestionMap& acked_packets,
     const CongestionMap& lost_packets) {
   if (rtt_updated && InSlowStart() &&
       hybrid_slow_start_.ShouldExitSlowStart(rtt_stats_->latest_rtt(),
                                              rtt_stats_->min_rtt(),
@@ skipping 261 matching lines @@
     return QuicTime::Delta::Zero();
   }
   return QuicTime::Delta::Infinite();
 }
 
 CongestionControlType TcpCubicSender::GetCongestionControlType() const {
   return reno_ ? kReno : kCubic;
 }
 
 }  // namespace net