Parse FlexFEC RTP headers in Call and add integration with BWE.

webrtc/modules/congestion_controller/include/mock/mock_congestion_controller.h

Index: webrtc/modules/congestion_controller/include/mock/mock_congestion_controller.h
diff --git a/webrtc/modules/congestion_controller/include/mock/mock_congestion_controller.h b/webrtc/modules/congestion_controller/include/mock/mock_congestion_controller.h
index 1b932dc8679322a5e8ac626722e4872528b80a2f..45e3dc0d633ea7fd39e31943a502ee88847458c0 100644
--- a/webrtc/modules/congestion_controller/include/mock/mock_congestion_controller.h
+++ b/webrtc/modules/congestion_controller/include/mock/mock_congestion_controller.h
@@ -14,6 +14,7 @@
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/socket.h"
 #include "webrtc/modules/congestion_controller/include/congestion_controller.h"
+#include "webrtc/modules/rtp_rtcp/source/rtp_packet_received.h"
 #include "webrtc/test/gmock.h"
 
 namespace webrtc {
@@ -44,6 +45,8 @@ class MockCongestionController : public CongestionController {
                              remote_bitrate_observer,
                              event_log,
                              packet_router) {}
+  MOCK_METHOD1(NotifyBweOfReceivedPacket,
+               void(const RtpPacketReceived& packet));
   MOCK_METHOD3(SetBweBitrates,
                void(int min_bitrate_bps,
                     int start_bitrate_bps,