Wire up FlexfecSender in RTP module and VideoSendStream.

webrtc/video_send_stream.h

Index: webrtc/video_send_stream.h
diff --git a/webrtc/video_send_stream.h b/webrtc/video_send_stream.h
index 4e727e5cd338bbdda90467b39ea9352a9e1d6006..74e9d5a5592af5d0868ae40d9f49278c2bbac3d2 100644
--- a/webrtc/video_send_stream.h
+++ b/webrtc/video_send_stream.h
@@ -137,6 +137,11 @@ class VideoSendStream {
       // See UlpfecConfig for description.
       UlpfecConfig ulpfec;
 
+      // See FlexfecConfig for description.
+      // TODO(brandtr): Move this config to a new class FlexfecSendStream
+      // when we support multistream protection.
+      FlexfecConfig flexfec;
+
       // Settings for RTP retransmission payload format, see RFC 4588 for
       // details.
       struct Rtx {