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

talk/media/webrtc/fakewebrtccall.cc

Index: talk/media/webrtc/fakewebrtccall.cc
diff --git a/talk/media/webrtc/fakewebrtccall.cc b/talk/media/webrtc/fakewebrtccall.cc
index 9f2c8e53df7b0ce5ec870f69d415cf81f72c2da1..cf5df8a768a70467539287a9dc95bb5d21dd4e73 100644
--- a/talk/media/webrtc/fakewebrtccall.cc
+++ b/talk/media/webrtc/fakewebrtccall.cc
@@ -236,6 +236,10 @@ const FakeAudioReceiveStream* FakeCall::GetAudioReceiveStream(uint32_t ssrc) {
   return nullptr;
 }
 
+webrtc::SentPacket FakeCall::last_packet_sent() const {
+  return last_packet_sent_;
+}
+
 webrtc::NetworkState FakeCall::GetNetworkState() const {
   return network_state_;
 }
@@ -367,4 +371,8 @@ void FakeCall::SetBitrateConfig(
 void FakeCall::SignalNetworkState(webrtc::NetworkState state) {
   network_state_ = state;
 }
+
+void FakeCall::OnSentPacket(const webrtc::SentPacket& packet_sent) {
+  last_packet_sent_ = packet_sent;
+}
 }  // namespace cricket