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

net/quic/crypto/proof_test.cc

Index: net/quic/crypto/proof_test.cc
diff --git a/net/quic/crypto/proof_test.cc b/net/quic/crypto/proof_test.cc
index d2669a8462e41f489afaf98107331370d80bc0e4..dcd826b3f3d403fdb33ba0916c99fa364614798d 100644
--- a/net/quic/crypto/proof_test.cc
+++ b/net/quic/crypto/proof_test.cc
@@ -119,7 +119,8 @@ class TestCallback : public ProofSource::Callback {
   void Run(bool ok,
            const scoped_refptr<ProofSource::Chain>& chain,
            const string& signature,
-           const string& leaf_cert_sct) override {
+           const string& leaf_cert_sct,
+           std::unique_ptr<ProofSource::Details> /* details */) override {
     *ok_ = ok;
     *chain_ = chain;
     *signature_ = signature;