Add test which verifies that the RTP header extensions are set correctly for FEC packets.

webrtc/modules/rtp_rtcp/source/rtp_sender_video.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 92 matching lines @@
   RTPSenderInterface& _rtpSender;
 
   // Should never be held when calling out of this class.
   const rtc::scoped_ptr<CriticalSectionWrapper> crit_;
 
   RtpVideoCodecTypes _videoType;
   uint32_t _maxBitrate;
   int32_t _retransmissionSettings GUARDED_BY(crit_);
 
   // FEC
-  ForwardErrorCorrection _fec;
-  bool _fecEnabled GUARDED_BY(crit_);
-  int8_t _payloadTypeRED GUARDED_BY(crit_);
-  int8_t _payloadTypeFEC GUARDED_BY(crit_);
+  ForwardErrorCorrection fec_;
+  bool fec_enabled_ GUARDED_BY(crit_);
+  int8_t red_payload_type_ GUARDED_BY(crit_);
+  int8_t fec_payload_type_ GUARDED_BY(crit_);
   FecProtectionParams delta_fec_params_ GUARDED_BY(crit_);
   FecProtectionParams key_fec_params_ GUARDED_BY(crit_);
   ProducerFec producer_fec_ GUARDED_BY(crit_);
 
   // Bitrate used for FEC payload, RED headers, RTP headers for FEC packets
   // and any padding overhead.
   Bitrate _fecOverheadRate;
   // Bitrate used for video payload and RTP headers
   Bitrate _videoBitrate;
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_SENDER_VIDEO_H_