Only set one QUIC sending alarm at once. Flag protected by --quic_only_one_sending_alarm.

net/quic/quic_flags.cc

 // Copyright 2014 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_flags.h"
 
 // When true, the use time based loss detection instead of nack.
 bool FLAGS_quic_use_time_loss_detection = false;
 
 // If true, it will return as soon as an error is detected while validating
@@ skipping 107 matching lines @@
 // Add the ability for QUIC's time based loss detection to increase it's
 // threshold after spurious losses.
 bool FLAGS_quic_adaptive_loss_recovery = true;
 
 // If true, enable auto tuning by default (server side).
 bool FLAGS_quic_enable_autotune_by_default = true;
 
 // Use largest acked in the most recent ack instead of largest acked ever in
 // loss recovery.
 bool FLAGS_quic_loss_recovery_use_largest_acked = true;
+
+// Only set one alarm for sending at once, either the send alarm or
+// retransmission alarm.
+bool FLAGS_quic_only_one_sending_alarm = true;