Reland of Only compare sequence numbers from the same SSRC in ForwardErrorCorrection.

webrtc/modules/rtp_rtcp/source/flexfec_receiver_unittest.cc

 /*
  *  Copyright (c) 2016 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 43 matching lines @@
   }
   // Expose methods for tests.
   using FlexfecReceiver::AddReceivedPacket;
   using FlexfecReceiver::ProcessReceivedPackets;
 };
 
 class FlexfecReceiverTest : public ::testing::Test {
  protected:
   FlexfecReceiverTest()
       : receiver_(kFlexfecSsrc, kMediaSsrc, &recovered_packet_receiver_),
-        erasure_code_(ForwardErrorCorrection::CreateFlexfec()),
+        erasure_code_(
+            ForwardErrorCorrection::CreateFlexfec(kFlexfecSsrc, kMediaSsrc)),
         packet_generator_(kMediaSsrc, kFlexfecSsrc) {}
 
   // Generates |num_media_packets| corresponding to a single frame.
   void PacketizeFrame(size_t num_media_packets,
                       size_t frame_offset,
                       PacketList* media_packets);
 
   // Generates |num_fec_packets| FEC packets, given |media_packets|.
   std::list<Packet*> EncodeFec(const PacketList& media_packets,
                                size_t num_fec_packets);
@@ skipping 486 matching lines @@
   receiver_.OnRtpPacket(ParsePacket(*packet_with_rtp_header));
 
   // Check stats calculations.
   FecPacketCounter packet_counter = receiver_.GetPacketCounter();
   EXPECT_EQ(2U, packet_counter.num_packets);
   EXPECT_EQ(1U, packet_counter.num_fec_packets);
   EXPECT_EQ(1U, packet_counter.num_recovered_packets);
 }
 
 }  // namespace webrtc