Integrate FlexfecReceiveStream with Call.

webrtc/call.h

Index: webrtc/call.h
diff --git a/webrtc/call.h b/webrtc/call.h
index 9855b600f050ebd64cd02a5639869c0b59c4e38e..d9143037c6edb4699d820fbfe402ceddd93a7c86 100644
--- a/webrtc/call.h
+++ b/webrtc/call.h
@@ -16,6 +16,7 @@
 #include "webrtc/api/call/audio_receive_stream.h"
 #include "webrtc/api/call/audio_send_stream.h"
 #include "webrtc/api/call/audio_state.h"
+#include "webrtc/api/call/flexfec_receive_stream.h"
 #include "webrtc/base/networkroute.h"
 #include "webrtc/base/platform_file.h"
 #include "webrtc/base/socket.h"
@@ -131,6 +132,11 @@ class Call {
   virtual void DestroyVideoReceiveStream(
       VideoReceiveStream* receive_stream) = 0;
 
+  virtual FlexfecReceiveStream* CreateFlexfecReceiveStream(
+      FlexfecReceiveStream::Config configuration) = 0;
+  virtual void DestroyFlexfecReceiveStream(
+      FlexfecReceiveStream* receive_stream) = 0;
+
   // All received RTP and RTCP packets for the call should be inserted to this
   // PacketReceiver. The PacketReceiver pointer is valid as long as the
   // Call instance exists.