Revert "Revert of Parse FlexFEC RTP headers in Call and add integration with BWE. (patchset #17 id:460001 of https://codereview.webrtc.org/2553863003/ )"

Problem fixed: RTP header extensions were not properly set in tests.

BUG=webrtc:5654

Review-Url: https://codereview.webrtc.org/2593963003
Cr-Commit-Position: refs/heads/master@{#15741}
diff --git a/webrtc/call/flexfec_receive_stream_impl.h b/webrtc/call/flexfec_receive_stream_impl.h
index 79c6cc0..7267dc0 100644
--- a/webrtc/call/flexfec_receive_stream_impl.h
+++ b/webrtc/call/flexfec_receive_stream_impl.h
@@ -18,16 +18,19 @@
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/call/flexfec_receive_stream.h"
 #include "webrtc/modules/rtp_rtcp/include/flexfec_receiver.h"
+#include "webrtc/modules/rtp_rtcp/source/rtp_packet_received.h"
 
 namespace webrtc {
 
 class FlexfecReceiveStreamImpl : public FlexfecReceiveStream {
  public:
   FlexfecReceiveStreamImpl(const Config& config,
-                           RecoveredPacketReceiver* recovered_packet_callback);
+                           RecoveredPacketReceiver* recovered_packet_receiver);
   ~FlexfecReceiveStreamImpl() override;
 
-  bool AddAndProcessReceivedPacket(const uint8_t* packet, size_t length);
+  const Config& GetConfig() const { return config_; }
+
+  bool AddAndProcessReceivedPacket(RtpPacketReceived packet);
 
   // Implements FlexfecReceiveStream.
   void Start() override;