Adds dynamic FEC on/off switch in packet creator. Tightens use of

net/quic/test_tools/quic_packet_creator_peer.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_TEST_TOOLS_QUIC_PACKET_CREATOR_PEER_H_
 #define NET_QUIC_TEST_TOOLS_QUIC_PACKET_CREATOR_PEER_H_
 
 #include "net/quic/quic_protocol.h"
 
 namespace net {
 class QuicPacketCreator;
 
 namespace test {
 
 class QuicPacketCreatorPeer {
  public:
   static bool SendVersionInPacket(QuicPacketCreator* creator);
 
   static void SetSendVersionInPacket(QuicPacketCreator* creator,
                                      bool send_version_in_packet);
   static void SetSequenceNumberLength(
       QuicPacketCreator* creator,
       QuicSequenceNumberLength sequence_number_length);
   static QuicSequenceNumberLength GetSequenceNumberLength(
       QuicPacketCreator* creator);
 
   static void SetIsServer(QuicPacketCreator* creator, bool is_server);
 
+  static bool SwitchFecProtectionOn(QuicPacketCreator* creator,
+                                    size_t max_packets_per_fec_group);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicPacketCreatorPeer);
 };
 
 }  // namespace test
 
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_QUIC_PACKET_CREATOR_PEER_H_