Add plumbing for passing stats from calls to ProofSource::GetProof through QUIC. These stats are n…

net/quic/crypto/proof_source_chromium.cc

Index: net/quic/crypto/proof_source_chromium.cc
diff --git a/net/quic/crypto/proof_source_chromium.cc b/net/quic/crypto/proof_source_chromium.cc
index a5c21c58794791be329076d43cb1031e759b5536..2a51492fbff8e512c085a4078b8a2ca4617f13d7 100644
--- a/net/quic/crypto/proof_source_chromium.cc
+++ b/net/quic/crypto/proof_source_chromium.cc
@@ -166,7 +166,7 @@ void ProofSourceChromium::GetProof(const IPAddress& server_ip,
   const bool ok =
       GetProof(server_ip, hostname, server_config, quic_version, chlo_hash,
                ecdsa_ok, &chain, &signature, &leaf_cert_sct);
-  callback->Run(ok, chain, signature, leaf_cert_sct);
+  callback->Run(ok, chain, signature, leaf_cert_sct, nullptr /* details */);
 }
 
 }  // namespace net