tree 63b0b48648ad8d28bd30b3e641d36bad8ff55224
parent 9772ae360b767e99d71cb3fe82c206565a0c2366
author wub <wub@google.com> 1626457807 -0700
committer Copybara-Service <copybara-worker@google.com> 1626457884 -0700

In QUIC TlsServerHandshaker, only run DefaultSignatureCallback at most once.

Protected by FLAGS_quic_reloadable_flag_quic_run_default_signature_callback_once.

PiperOrigin-RevId: 385179619