Add QUIC handshake accounting. Protected by

net/quic/core/quic_crypto_server_stream.cc

Index: net/quic/core/quic_crypto_server_stream.cc
diff --git a/net/quic/core/quic_crypto_server_stream.cc b/net/quic/core/quic_crypto_server_stream.cc
index d45cccd90adbfc27d846accf4190597d08ec094f..6912d2f88364c80a14ac237c6cc1392033d90f94 100644
--- a/net/quic/core/quic_crypto_server_stream.cc
+++ b/net/quic/core/quic_crypto_server_stream.cc
@@ -97,6 +97,7 @@ QuicCryptoServerStream::QuicCryptoServerStream(
       use_stateless_rejects_if_peer_supported_(
           use_stateless_rejects_if_peer_supported),
       peer_supports_stateless_rejects_(false),
+      zero_rtt_attempted_(false),
       chlo_packet_size_(0),
       validate_client_hello_cb_(nullptr),
       process_client_hello_cb_(nullptr) {
@@ -373,6 +374,10 @@ bool QuicCryptoServerStream::PeerSupportsStatelessRejects() const {
   return peer_supports_stateless_rejects_;
 }
 
+bool QuicCryptoServerStream::ZeroRttAttempted() const {
+  return zero_rtt_attempted_;
+}
+
 void QuicCryptoServerStream::SetPeerSupportsStatelessRejects(
     bool peer_supports_stateless_rejects) {
   peer_supports_stateless_rejects_ = peer_supports_stateless_rejects;
@@ -413,10 +418,16 @@ void QuicCryptoServerStream::ProcessClientHello(
                  nullptr);
     return;
   }
-
   if (!result->info.server_nonce.empty()) {
     ++num_handshake_messages_with_server_nonces_;
   }
+
+  if (num_handshake_messages_ == 1) {
+    // Client attempts zero RTT handshake by sending a non-inchoate CHLO.
+    QuicStringPiece public_value;
+    zero_rtt_attempted_ = message.GetStringPiece(kPUBS, &public_value);
+  }
+
   // Store the bandwidth estimate from the client.
   if (result->cached_network_params.bandwidth_estimate_bytes_per_second() > 0) {
     previous_cached_network_params_.reset(