Add a Clone method to ProofVerifyDetails to allow for the proof verify

net/quic/crypto/proof_verifier_chromium.cc

Index: net/quic/crypto/proof_verifier_chromium.cc
diff --git a/net/quic/crypto/proof_verifier_chromium.cc b/net/quic/crypto/proof_verifier_chromium.cc
index 43cd52bacf986153f4efef483192d64a99a4ed9c..443c0e352ea5336987ff7142e1609d4dd99c108b 100644
--- a/net/quic/crypto/proof_verifier_chromium.cc
+++ b/net/quic/crypto/proof_verifier_chromium.cc
@@ -31,6 +31,12 @@ using std::vector;
 
 namespace net {
 
+ProofVerifyDetails* ProofVerifyDetailsChromium::Clone() const {
+  ProofVerifyDetailsChromium* other = new ProofVerifyDetailsChromium;
+  other->cert_verify_result = cert_verify_result;
+  return other;
+}
+
 // A Job handles the verification of a single proof.  It is owned by the
 // ProofVerifier. If the verification can not complete synchronously, it
 // will notify the ProofVerifier upon completion.