Add num_ptos_for_path_degrading_ getter in QuicSentPacketManagerPeer.

This will allow testing on Envoy's port migration.

PiperOrigin-RevId: 405706187

quic/test_tools/quic_sent_packet_manager_peer.cc

diff --git a/quic/test_tools/quic_sent_packet_manager_peer.cc b/quic/test_tools/quic_sent_packet_manager_peer.cc
index 0789946..7d1ba86 100644
--- a/quic/test_tools/quic_sent_packet_manager_peer.cc
+++ b/quic/test_tools/quic_sent_packet_manager_peer.cc
@@ -214,5 +214,11 @@
       .use_packet_threshold_for_runt_packets();
 }
 
+// static
+int QuicSentPacketManagerPeer::GetNumPtosForPathDegrading(
+    QuicSentPacketManager* sent_packet_manager) {
+  return sent_packet_manager->num_ptos_for_path_degrading_;
+}
+
 }  // namespace test
 }  // namespace quic

quic/test_tools/quic_sent_packet_manager_peer.h

diff --git a/quic/test_tools/quic_sent_packet_manager_peer.h b/quic/test_tools/quic_sent_packet_manager_peer.h
index 23a8664..a39915f 100644
--- a/quic/test_tools/quic_sent_packet_manager_peer.h
+++ b/quic/test_tools/quic_sent_packet_manager_peer.h
@@ -98,6 +98,9 @@
 
   static bool UsePacketThresholdForRuntPackets(
       QuicSentPacketManager* sent_packet_manager);
+
+  static int GetNumPtosForPathDegrading(
+      QuicSentPacketManager* sent_packet_manager);
 };
 
 }  // namespace test