Integrate FlexfecReceiveStream with Call.

webrtc/media/engine/fakewebrtccall.h

Index: webrtc/media/engine/fakewebrtccall.h
diff --git a/webrtc/media/engine/fakewebrtccall.h b/webrtc/media/engine/fakewebrtccall.h
index db3db1884d77fb9f01d74e99d588d45c53c30631..aec22a3d2d8b47601a20879ed832382b5d2ac49f 100644
--- a/webrtc/media/engine/fakewebrtccall.h
+++ b/webrtc/media/engine/fakewebrtccall.h
@@ -228,6 +228,12 @@ class FakeCall final : public webrtc::Call, public webrtc::PacketReceiver {
       webrtc::VideoReceiveStream::Config config) override;
   void DestroyVideoReceiveStream(
       webrtc::VideoReceiveStream* receive_stream) override;
+
+  webrtc::FlexfecReceiveStream* CreateFlexfecReceiveStream(
+      webrtc::FlexfecReceiveStream::Config config) override;
+  void DestroyFlexfecReceiveStream(
+      webrtc::FlexfecReceiveStream* receive_stream) override;
+
   webrtc::PacketReceiver* Receiver() override;
 
   DeliveryStatus DeliverPacket(webrtc::MediaType media_type,