Default enable QUIC's Cubic in bytes congestion control implementation. Protected by ENABLED FLAGS…

net/quic/core/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/core/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 
 #include <algorithm>
@@ skipping 247 matching lines @@
                         &framer_,
                         random_generator_,
                         helper->GetBufferAllocator(),
                         this),
       idle_network_timeout_(QuicTime::Delta::Infinite()),
       handshake_timeout_(QuicTime::Delta::Infinite()),
       time_of_last_received_packet_(clock_->ApproximateNow()),
       time_of_last_sent_new_packet_(clock_->ApproximateNow()),
       last_send_for_timeout_(clock_->ApproximateNow()),
       packet_number_of_last_sent_packet_(0),
-      sent_packet_manager_(new QuicSentPacketManager(perspective,
-                                                     kDefaultPathId,
-                                                     clock_,
-                                                     &stats_,
-                                                     kCubic,
-                                                     kNack,
-                                                     /*delegate=*/nullptr)),
+      sent_packet_manager_(new QuicSentPacketManager(
+          perspective,
+          kDefaultPathId,
+          clock_,
+          &stats_,
+          FLAGS_quic_default_enable_cubic_bytes ? kCubicBytes : kCubic,
+          kNack,
+          /*delegate=*/nullptr)),
       version_negotiation_state_(START_NEGOTIATION),
       perspective_(perspective),
       connected_(true),
       can_truncate_connection_ids_(true),
       mtu_discovery_target_(0),
       mtu_probe_count_(0),
       packets_between_mtu_probes_(kPacketsBetweenMtuProbesBase),
       next_mtu_probe_at_(kPacketsBetweenMtuProbesBase),
       largest_received_packet_size_(0),
       goaway_sent_(false),
@@ skipping 2295 matching lines @@
 
 void QuicConnection::CheckIfApplicationLimited() {
   if (queued_packets_.empty() &&
       !sent_packet_manager_->HasPendingRetransmissions() &&
       !visitor_->WillingAndAbleToWrite()) {
     sent_packet_manager_->OnApplicationLimited();
   }
 }
 
 }  // namespace net