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

webrtc/video_engine/vie_channel_group.cc

Index: webrtc/video_engine/vie_channel_group.cc
diff --git a/webrtc/video_engine/vie_channel_group.cc b/webrtc/video_engine/vie_channel_group.cc
index 6553ce2e04dcea487b7d4338ec72d1d1ac48060a..389cb1ccac26adf918b3364c712f3f55f899b2c5 100644
--- a/webrtc/video_engine/vie_channel_group.cc
+++ b/webrtc/video_engine/vie_channel_group.cc
@@ -418,4 +418,11 @@ void ChannelGroup::OnNetworkChanged(uint32_t target_bitrate_bps,
       PacedSender::kDefaultPaceMultiplier * target_bitrate_bps / 1000,
       pad_up_to_bitrate_bps / 1000);
 }
+
+void ChannelGroup::OnSentPacket(const SentPacket& packet_sent) {
+  if (transport_feedback_adapter_.get() != nullptr) {
+    transport_feedback_adapter_->UpdateSendTime(
+        packet_sent.transport_sequence_number, packet_sent.send_time_ms);
+  }
+}
 }  // namespace webrtc