Wire up BitrateAllocation to be sent as RTCP TargetBitrate

webrtc/modules/video_coding/video_coding_impl.cc

Index: webrtc/modules/video_coding/video_coding_impl.cc
diff --git a/webrtc/modules/video_coding/video_coding_impl.cc b/webrtc/modules/video_coding/video_coding_impl.cc
index 021281bffa07a5d81b8f2a7e479a1bb62543073e..85511bc9d44def7116ee702a3260b3f265472b30 100644
--- a/webrtc/modules/video_coding/video_coding_impl.cc
+++ b/webrtc/modules/video_coding/video_coding_impl.cc
@@ -146,7 +146,7 @@ class VideoCodingModuleImpl : public VideoCodingModule {
                                uint8_t lossRate,
                                int64_t rtt) override {
     return sender_.SetChannelParameters(target_bitrate, lossRate, rtt,
-                                        rate_allocator_.get());
+                                        rate_allocator_.get(), nullptr);
   }
 
   int32_t RegisterProtectionCallback(