Add read support of RtpStreamId/RepairedRtpStreamId header extensions.

webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
index ddfec4d7cd7c351209c36c77c218c08d54bca1b5..4aa8cf8f02b0e7afc80fd08c19dc3d13628708d9 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
@@ -76,6 +76,8 @@ enum RTPExtensionType {
   kRtpExtensionVideoRotation,
   kRtpExtensionTransportSequenceNumber,
   kRtpExtensionPlayoutDelay,
+  kRtpExtensionRtpStreamId,
+  kRtpExtensionRepairRtpStreamId,

[pthatcher1, 2017/04/06 21:17:34]

It's a "Repaired Stream", not a "Repair Stream".  Those two things mean the
opposite.  One is a reference to the thing being prepared (repaired) and the
other is the thing that's doing the repairing (repair).   What we have in the
spec is the former.

[danilchap, 2017/04/07 07:07:49]

Done.
also adjusted sample names in test to stress it.

[nisse-webrtc, 2017/04/07 08:41:23]

Please also update cl title and description.

   kRtpExtensionNumberOfExtensions,
 };