Prepare the AudioSendStream to be hooked up to send-side BWE.

webrtc/voice_engine/channel_proxy.cc

Index: webrtc/voice_engine/channel_proxy.cc
diff --git a/webrtc/voice_engine/channel_proxy.cc b/webrtc/voice_engine/channel_proxy.cc
index 614b7b72fec1c4bde156085710acf0660de294b2..2ca72a844c0a1e15cc99735232327c7541bb1087 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -64,6 +64,20 @@ void ChannelProxy::SetReceiveAudioLevelIndicationStatus(bool enable, int id) {
   RTC_DCHECK_EQ(0, error);
 }
 
+void ChannelProxy::SetSendTransportSequenceNumber(int id) {

[the sun, 2015/12/01 10:25:36]

soo nit: but can you please move me with the other senders, I feel so lonely
(and in the .h, and in the mock)?

[stefan-webrtc, 2015/12/01 16:19:33]

Done.

+  RTC_DCHECK(channel_owner_.channel());

[the sun, 2015/12/01 10:25:36]

no need for this DCHECK; already done in channel()

[stefan-webrtc, 2015/12/01 16:19:33]

Done.

+  channel()->SetSendTransportSequenceNumber(id);
+}
+
+void ChannelProxy::SetCongestionControlObjects(
+    RtpPacketSender* rtp_packet_sender,
+    TransportFeedbackObserver* transport_feedback_observer,
+    PacketRouter* packet_router) {
+  RTC_DCHECK(channel_owner_.channel());
+  channel()->SetCongestionControlObjects(
+      rtp_packet_sender, transport_feedback_observer, packet_router);
+}
+
 CallStatistics ChannelProxy::GetRTCPStatistics() const {
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   CallStatistics stats = {0};
@@ -112,5 +126,6 @@ Channel* ChannelProxy::channel() const {
   RTC_DCHECK(channel_owner_.channel());
   return channel_owner_.channel();
 }
+
 }  // namespace voe
 }  // namespace webrtc