Pause/resume pacer from Call instead of via SendStreams.

webrtc/video_engine/vie_channel_group.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 404 matching lines @@
   } else {
     remb_->RemoveRembSender(rtp_module);
   }
   if (receiver) {
     remb_->AddReceiveChannel(rtp_module);
   } else {
     remb_->RemoveReceiveChannel(rtp_module);
   }
 }
 
+void ChannelGroup::SignalNetworkState(NetworkState state) {
+  if (state == kNetworkUp) {
+    pacer_->Resume();
+  } else {
+    pacer_->Pause();
+  }
+}
+
 void ChannelGroup::OnNetworkChanged(uint32_t target_bitrate_bps,
                                     uint8_t fraction_loss,
                                     int64_t rtt) {
   bitrate_allocator_->OnNetworkChanged(target_bitrate_bps, fraction_loss, rtt);
   int pad_up_to_bitrate_bps = 0;
   {
     rtc::CritScope lock(&encoder_map_crit_);
     for (const auto& encoder : vie_encoder_map_)
       pad_up_to_bitrate_bps += encoder.second->GetPaddingNeededBps();
   }
   pacer_->UpdateBitrate(
       target_bitrate_bps / 1000,
       PacedSender::kDefaultPaceMultiplier * target_bitrate_bps / 1000,
       pad_up_to_bitrate_bps / 1000);
 }
 }  // namespace webrtc