gfe-relnote: Set first_pto_srtt_multiplier_ to 0.5, just like the PLE1 connection option, when TLPR is present and PTO is enabled in QUIC.  Protected by existing unverified flag quic_arm_pto_with_earliest_sent_time.

PiperOrigin-RevId: 300630596
Change-Id: I132f97ecd55e7b489c5bbf232010f689993d91fa

quic/core/quic_sent_packet_manager.cc

diff --git a/quic/core/quic_sent_packet_manager.cc b/quic/core/quic_sent_packet_manager.cc
index 1b62e67..3e02c55 100644
--- a/quic/core/quic_sent_packet_manager.cc
+++ b/quic/core/quic_sent_packet_manager.cc
@@ -189,7 +189,8 @@
       num_tlp_timeout_ptos_ = 2;
     }
     if (GetQuicReloadableFlag(quic_arm_pto_with_earliest_sent_time)) {
-      if (config.HasClientSentConnectionOption(kPLE1, perspective)) {
+      if (config.HasClientSentConnectionOption(kPLE1, perspective) ||
+          config.HasClientSentConnectionOption(kTLPR, perspective)) {
         QUIC_RELOADABLE_FLAG_COUNT_N(quic_arm_pto_with_earliest_sent_time, 1,
                                      2);
         first_pto_srtt_multiplier_ = 0.5;