Add methods to the QuicConnectionDebug visitor for tracking various

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index 4a99c2fea287995f69f311535a18601ce524f64b..6e6d05f50f9699054e3eae7513530eeb809f11f8 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -443,6 +443,10 @@ bool QuicConnection::OnPacketHeader(const QuicPacketHeader& header) {
     DVLOG(1) << ENDPOINT << "Ignoring packet from unexpected ConnectionId: "
              << header.public_header.connection_id << " instead of "
              << connection_id_;
+    if (debug_visitor_.get() != NULL) {
+      debug_visitor_->OnIncorrectConnectionId(
+          header.public_header.connection_id);
+    }
     return false;
   }
 
@@ -461,8 +465,9 @@ bool QuicConnection::OnPacketHeader(const QuicPacketHeader& header) {
           header.packet_sequence_number)) {
     DVLOG(1) << ENDPOINT << "Packet " << header.packet_sequence_number
              << " no longer being waited for.  Discarding.";
-    // TODO(jri): Log reception of duplicate packets or packets the peer has
-    // told us to stop waiting for.
+    if (debug_visitor_.get() != NULL) {
+      debug_visitor_->OnDuplicatePacket(header.packet_sequence_number);
+    }
     return false;
   }
 
@@ -1087,10 +1092,13 @@ void QuicConnection::ProcessUdpPacket(const IPEndPoint& self_address,
   if (!framer_.ProcessPacket(packet)) {
     // If we are unable to decrypt this packet, it might be
     // because the CHLO or SHLO packet was lost.
-    if (encryption_level_ != ENCRYPTION_FORWARD_SECURE &&
-        framer_.error() == QUIC_DECRYPTION_FAILURE &&
-        undecryptable_packets_.size() < kMaxUndecryptablePackets) {
-      QueueUndecryptablePacket(packet);
+    if (framer_.error() == QUIC_DECRYPTION_FAILURE) {
+      if (encryption_level_ != ENCRYPTION_FORWARD_SECURE &&
+          undecryptable_packets_.size() < kMaxUndecryptablePackets) {
+        QueueUndecryptablePacket(packet);
+      } else if (debug_visitor_ != NULL) {
+        debug_visitor_->OnUndecryptablePacket();
+      }
     }
     DVLOG(1) << ENDPOINT << "Unable to process packet.  Last packet processed: "
              << last_header_.packet_sequence_number;
@@ -1687,6 +1695,11 @@ void QuicConnection::MaybeProcessUndecryptablePackets() {
   // new keys installed and hence any undecryptable packets will
   // never be able to be decrypted.
   if (encryption_level_ == ENCRYPTION_FORWARD_SECURE) {
+    if (debug_visitor_ != NULL) {
+      for (size_t i = 0; i < undecryptable_packets_.size(); ++i) {
+        debug_visitor_->OnUndecryptablePacket();
+      }
+    }
     STLDeleteElements(&undecryptable_packets_);
   }
 }