Adds an internal server and chromium's flag for disabling/enabling FEC

net/quic/quic_flags.cc

Index: net/quic/quic_flags.cc
diff --git a/net/quic/quic_flags.cc b/net/quic/quic_flags.cc
index deeee4704bbb37b9945b18277369b0223b5045c3..58980b343188f17203a4965fa7eb5c7257cd232f 100644
--- a/net/quic/quic_flags.cc
+++ b/net/quic/quic_flags.cc
@@ -39,3 +39,8 @@ bool FLAGS_use_early_return_when_verifying_chlo = true;
 
 // If true, QUIC crypto reject message will include the reasons for rejection.
 bool FLAGS_send_quic_crypto_reject_reason = false;
+
+// If true, QUIC connections will support FEC protection of data while sending
+// packets, to reduce latency of data delivery to the application. The client
+// must also request FEC protection for the server to use FEC.
+bool FLAGS_enable_quic_fec = false;