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

net/tools/quic/stateless_rejector.cc

Index: net/tools/quic/stateless_rejector.cc
diff --git a/net/tools/quic/stateless_rejector.cc b/net/tools/quic/stateless_rejector.cc
index 0fbbedd88c406adb0741c8a44306f613935ab92e..2dc4a3c0cf5af2764d205cc3450ff1ac036fbe32 100644
--- a/net/tools/quic/stateless_rejector.cc
+++ b/net/tools/quic/stateless_rejector.cc
@@ -18,7 +18,9 @@ class StatelessRejector::ValidateCallback
   ~ValidateCallback() override {}
 
   void RunImpl(const CryptoHandshakeMessage& client_hello,
-               const Result& result) override {
+               const Result& result,
+               std::unique_ptr<ProofSource::Details> /* proof_source_details */)
+      override {
     rejector_->ProcessClientHello(client_hello, result);
   }