Wire up transport sequence number / send time callbacks to webrtc via libjingle.

talk/media/webrtc/webrtcvideoengine2.cc

Index: talk/media/webrtc/webrtcvideoengine2.cc
diff --git a/talk/media/webrtc/webrtcvideoengine2.cc b/talk/media/webrtc/webrtcvideoengine2.cc
index 2f0634043dbb9ec3bfb441c89421f6bc21835f94..29c94f1c9e71104353abee5e6f702acf0d848413 100644
--- a/talk/media/webrtc/webrtcvideoengine2.cc
+++ b/talk/media/webrtc/webrtcvideoengine2.cc
@@ -561,6 +561,9 @@ WebRtcVideoEngine2::WebRtcVideoEngine2()
   rtp_header_extensions_.push_back(
       RtpHeaderExtension(kRtpVideoRotationHeaderExtension,
                          kRtpVideoRotationHeaderExtensionDefaultId));
+  rtp_header_extensions_.push_back(
+      RtpHeaderExtension(kRtpTransportSequenceNumberHeaderExtension,
+                         kRtpTransportSequenceNumberHeaderExtensionDefaultId));
 }
 
 WebRtcVideoEngine2::~WebRtcVideoEngine2() {
@@ -1662,12 +1665,14 @@ bool WebRtcVideoChannel2::SendRtp(const uint8_t* data,
                                   size_t len,
                                   const webrtc::PacketOptions& options) {

[pthatcher1, 2015/10/05 18:30:13]

Would it be possible to have one PacketOptions struct instead of two?  If not,
can we enumerate the reasons why not in the definition of the second one and
then have a TODO saying when we should unify them?

[pthatcher1, 2015/10/07 16:44:37]

?

[stefan-webrtc, 2015/10/07 16:55:24]

I'd be happy to follow-up with a CL which does this, but since the
webrtc::Transport interface I think it's better to do it in a separate CL.

   rtc::Buffer packet(data, len, kMaxRtpPacketLen);
-  return MediaChannel::SendPacket(&packet);
+  rtc::PacketOptions rtc_options;
+  rtc_options.packet_id = options.packet_id;
+  return MediaChannel::SendPacket(&packet, rtc_options);
 }
 
 bool WebRtcVideoChannel2::SendRtcp(const uint8_t* data, size_t len) {
   rtc::Buffer packet(data, len, kMaxRtpPacketLen);
-  return MediaChannel::SendRtcp(&packet);
+  return MediaChannel::SendRtcp(&packet, rtc::PacketOptions());
 }
 
 void WebRtcVideoChannel2::StartAllSendStreams() {