Add PeerConnectionInterface::UpdateCallBitrate.

webrtc/pc/peerconnection.cc

Index: webrtc/pc/peerconnection.cc
diff --git a/webrtc/pc/peerconnection.cc b/webrtc/pc/peerconnection.cc
index a3981039e6cfe89554092b4c14d7f2f7b0f175e4..b5525d53a728b7df0b862302a5084f2d5ba0f843 100644
--- a/webrtc/pc/peerconnection.cc
+++ b/webrtc/pc/peerconnection.cc
@@ -1235,6 +1235,26 @@ void PeerConnection::RegisterUMAObserver(UMAObserver* observer) {
   }
 }
 
+void PeerConnection::UpdateCallBitrate(const BitrateUpdate& update) {
+  factory_->worker_thread()->Invoke<void>(
+      RTC_FROM_HERE,
+      rtc::Bind(&PeerConnection::UpdateCallBitrate_w, this, update));
+}
+
+void PeerConnection::UpdateCallBitrate_w(const BitrateUpdate& update) {
+  Call::Config::BitrateConfigMask mask;
+  mask.min_bitrate_bps = update.min_bitrate_bps;
+  mask.start_bitrate_bps = update.start_bitrate_bps;
+  mask.max_bitrate_bps = update.max_bitrate_bps;
+
+  if (media_controller_) {
+    Call* call = media_controller_->call_w();
+    call->UpdateBitrateConfig(mask);
+  } else {
+    LOG_F(LS_ERROR) << "media_controller_ is NULL.";

[stefan-webrtc, 2017/04/10 13:26:58]

Can we simply DCHECK on this instead, or is it possible for a user to provoke
this?

[Zach Stein, 2017/04/10 22:27:53]

The user can only hit this if they call UpdateCallBitrate before Initialize - so
it shouldn't ever happen, but if we only have a DCHECK we could dereference a
nullptr, so I think this is the right thing to do.

+  }
+}
+
 bool PeerConnection::StartRtcEventLog(rtc::PlatformFile file,
                                       int64_t max_size_bytes) {
   return factory_->worker_thread()->Invoke<bool>(