Fix and improve FlexFEC configuration for RTP/RTCP.

webrtc/media/engine/fakewebrtccall.h

 /*
  *  Copyright (c) 2015 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 156 matching lines @@
   int num_swapped_frames_;
   rtc::Optional<webrtc::VideoFrame> last_frame_;
   webrtc::VideoSendStream::Stats stats_;
   int num_encoder_reconfigurations_ = 0;
 };
 
 class FakeVideoReceiveStream final : public webrtc::VideoReceiveStream {
  public:
   explicit FakeVideoReceiveStream(webrtc::VideoReceiveStream::Config config);
 
-  const webrtc::VideoReceiveStream::Config& GetConfig();
+  const webrtc::VideoReceiveStream::Config& GetConfig() const;
 
   bool IsReceiving() const;
 
   void InjectFrame(const webrtc::VideoFrame& frame);
 
   void SetStats(const webrtc::VideoReceiveStream::Stats& stats);
 
   void EnableEncodedFrameRecording(rtc::PlatformFile file,
                                    size_t byte_limit) override;
 
@@ skipping 114 matching lines @@
 
   int num_created_send_streams_;
   int num_created_receive_streams_;
 
   int audio_transport_overhead_;
   int video_transport_overhead_;
 };
 
 }  // namespace cricket
 #endif  // WEBRTC_MEDIA_ENGINE_FAKEWEBRTCCALL_H_