gfe-relnote: Add detailed_error_ to error message when failed to parse a received coalesced header. Logging only change, not protected.

PiperOrigin-RevId: 296434265
Change-Id: Iacc2c269a4f9b98893f67a502d34eeac4c176dcc

quic/core/quic_framer.cc

diff --git a/quic/core/quic_framer.cc b/quic/core/quic_framer.cc
index c6231e8..280e464 100644
--- a/quic/core/quic_framer.cc
+++ b/quic/core/quic_framer.cc
@@ -1582,7 +1582,8 @@
   if (!ProcessIetfPacketHeader(&coalesced_reader, &coalesced_header)) {
     QUIC_PEER_BUG << ENDPOINT
                   << "Failed to parse received coalesced header of length "
-                  << coalesced_data_length << ": "
+                  << coalesced_data_length << " with error: " << detailed_error_
+                  << ": "
                   << quiche::QuicheTextUtils::HexEncode(coalesced_data,
                                                         coalesced_data_length)
                   << " previous header was " << header;