Increment connection_close_errors histogram on dispatcher sent connection close.

PiperOrigin-RevId: 363065275
Change-Id: I9c072c69e1de43e7746a45f17c5238d245e529da
diff --git a/quic/core/quic_dispatcher.cc b/quic/core/quic_dispatcher.cc
index 3c18b00..ab5a147 100644
--- a/quic/core/quic_dispatcher.cc
+++ b/quic/core/quic_dispatcher.cc
@@ -1155,6 +1155,9 @@
     terminator.CloseConnection(
         error_code, error_details, format != GOOGLE_QUIC_PACKET,
         /*active_connection_ids=*/{server_connection_id});
+    QUIC_CODE_COUNT(quic_dispatcher_generated_connection_close);
+    QuicSession::RecordConnectionCloseAtServer(
+        error_code, ConnectionCloseSource::FROM_SELF);
     return;
   }