Add a new QuicFlagSaver class for saving/restoring the values of QUIC flags in tests.

net/quic/core/quic_flags.h

Index: net/quic/core/quic_flags.h
diff --git a/net/quic/core/quic_flags.h b/net/quic/core/quic_flags.h
index 5182440396f2bc1f096fbd17310eb78c5d169b7a..70c9d2e9ad27d2f4508043162e8806da815dccca 100644
--- a/net/quic/core/quic_flags.h
+++ b/net/quic/core/quic_flags.h
@@ -9,47 +9,8 @@
 
 #include "net/base/net_export.h"
 
-NET_EXPORT_PRIVATE extern bool FLAGS_use_early_return_when_verifying_chlo;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_allow_bbr;
-NET_EXPORT_PRIVATE extern int64_t FLAGS_quic_time_wait_list_seconds;
-NET_EXPORT_PRIVATE extern int64_t FLAGS_quic_time_wait_list_max_connections;
-NET_EXPORT_PRIVATE extern bool FLAGS_enable_quic_stateless_reject_support;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_always_log_bugs_for_tests;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_enable_multipath;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_require_handshake_confirmation;
-NET_EXPORT_PRIVATE extern bool FLAGS_shift_quic_cubic_epoch_when_app_limited;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_measure_headers_hol_blocking_time;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_disable_pacing_for_perf_tests;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_never_write_unencrypted_data;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_no_lower_bw_resumption_limit;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_loss_recovery_use_largest_acked;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_only_one_sending_alarm;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_use_old_public_reset_packets;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_use_cheap_stateless_rejects;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_respect_http2_settings_frame;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_enable_version_35;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_enable_version_36;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_enable_version_36_v2;
-NET_EXPORT_PRIVATE extern bool FLAGS_enable_async_get_proof;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_neuter_unencrypted_when_sending;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_change_alarms_efficiently;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_require_handshake_confirmation_pre33;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_sequencer_buffer_retire_block_in_time;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_remove_obsolete_forward_secure;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_close_connection_on_packet_too_large;
-NET_EXPORT_PRIVATE extern bool
-    FLAGS_quic_close_stream_after_writing_queued_data;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_limit_frame_gaps_in_buffer;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_remove_v33_hacks;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_use_chlo_packet_size;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_buffer_packet_till_chlo;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_enable_app_limited_check;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_simple_packet_number_length_2;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_disable_pre_32;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_enforce_mtu_limit;
-NET_EXPORT_PRIVATE extern bool FLAGS_graceful_emsgsize_on_mtu_probe;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_do_not_send_ack_on_emsgsize;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_postpone_multipath_flag_validation;
-NET_EXPORT_PRIVATE extern bool FLAGS_quic_better_last_send_for_timeout;
+#define QUIC_FLAG(type, flag, value) NET_EXPORT_PRIVATE extern type flag;
+#include "net/quic/core/quic_flags_list.h"
+#undef QUIC_FLAG
 
 #endif  // NET_QUIC_QUIC_FLAGS_H_