Move logic for calculating needed bitrate overhead used by NACK and FEC to VideoSender.

webrtc/video/send_statistics_proxy.cc

Index: webrtc/video/send_statistics_proxy.cc
diff --git a/webrtc/video/send_statistics_proxy.cc b/webrtc/video/send_statistics_proxy.cc
index d8c11a8c3588ee061bfcca9189fe531709f6f066..abaa43800543ad29c7ef749848d0f1aa33954e4a 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -513,6 +513,11 @@ void SendStatisticsProxy::OnSendEncodedImage(
                static_cast<int>(encoded_image._encodedHeight));
 }
 
+int SendStatisticsProxy::GetSendFrameRate() const {
+  rtc::CritScope lock(&crit_);
+  return stats_.encode_frame_rate;
+}
+
 void SendStatisticsProxy::OnIncomingFrame(int width, int height) {
   rtc::CritScope lock(&crit_);
   uma_container_->input_frame_rate_tracker_.AddSamples(1);