Flip FLAGS_quic_reloadable_flag_quic_use_event_time to true.

net/quic/core/quic_flags_list.h

 // 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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate values.
 
 // This file contains the list of QUIC protocol flags.
 
 // If true, QUIC BBR congestion control may be enabled via Finch and/or via QUIC
@@ skipping 141 matching lines @@
 // beginning of a connection.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_send_max_header_list_size, true)
 
 // If true, fix quantization of CubicBytes while performing convex increases.
 QUIC_FLAG(bool,
           FLAGS_quic_reloadable_flag_quic_fix_cubic_bytes_quantization,
           false)
 
 // If true, QUIC cubic code will use the event time when adjusting CWND after an
 // ACK instead of the clock\'s current approximate time.
-QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_event_time, false)
+QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_use_event_time, true)
 
 // If true, lazy allocate and early release memeory used in
 // QuicStreamSequencerBuffer to buffer incoming data.
 QUIC_FLAG(
     bool,
     FLAGS_quic_reloadable_flag_quic_reduce_sequencer_buffer_memory_life_time,
     true)
 
 // If true, Makes GFE respect the connection options for initial flow control
 // window larger than 32 KB.
@@ skipping 10 matching lines @@
 
 // Allow quic to properly support proxying 100 Continue responses.
 QUIC_FLAG(bool, FLAGS_quic_restart_flag_quic_supports_100_continue, false)
 
 // If true, enable quic version 38
 QUIC_FLAG(bool, FLAGS_quic_enable_version_38, false)
 
 // When true, ensures the session's flow control window is always at least 1.5x
 // larger than the largest stream flow control window.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_flow_control_invariant, false)