Landing Recent QUIC changes until 5:55 PM, Aug 25, 2016 UTC-4

net/quic/core/quic_connection.cc

Index: net/quic/core/quic_connection.cc
diff --git a/net/quic/core/quic_connection.cc b/net/quic/core/quic_connection.cc
index cb1f761c55cbf35b0bd5590353bf891430bb2098..734740cf849bdbb5d704c240fe8d5a5d5441326c 100644
--- a/net/quic/core/quic_connection.cc
+++ b/net/quic/core/quic_connection.cc
@@ -548,8 +548,13 @@ void QuicConnection::OnVersionNegotiationPacket(
   }
 
   if (!SelectMutualVersion(packet.versions)) {
-    CloseConnection(QUIC_INVALID_VERSION, "No common version found.",
-                    ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
+    CloseConnection(
+        QUIC_INVALID_VERSION,
+        "No common version found. Supported versions: {" +
+            QuicVersionVectorToString(framer_.supported_versions()) +
+            "}, peer supported versions: {" +
+            QuicVersionVectorToString(packet.versions) + "}",
+        ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return;
   }