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

webrtc/video_engine/vie_channel_group.h

Index: webrtc/video_engine/vie_channel_group.h
diff --git a/webrtc/video_engine/vie_channel_group.h b/webrtc/video_engine/vie_channel_group.h
index 374bd003330d214162d1aaa063b4640dc3993841..d94d77c9e79f177a096a58d87a13d59af93210b9 100644
--- a/webrtc/video_engine/vie_channel_group.h
+++ b/webrtc/video_engine/vie_channel_group.h
@@ -80,6 +80,8 @@ class ChannelGroup : public BitrateObserver {
                         uint8_t fraction_loss,
                         int64_t rtt) override;
 
+  void OnPacketSent(const SentPacket& packet_sent);
+
  private:
   typedef std::map<int, ViEChannel*> ChannelMap;
   typedef std::map<int, ViEEncoder*> EncoderMap;