Update smoothed bitrate.

webrtc/audio/audio_send_stream.h

Index: webrtc/audio/audio_send_stream.h
diff --git a/webrtc/audio/audio_send_stream.h b/webrtc/audio/audio_send_stream.h
index af0513ccf776fd5513f7b10ca17bb0960d1d2ec4..4c3ffe5ec21c6f64fe6a300f8da5ac2a830e510b 100644
--- a/webrtc/audio/audio_send_stream.h
+++ b/webrtc/audio/audio_send_stream.h
@@ -16,6 +16,7 @@
 #include "webrtc/api/call/audio_send_stream.h"
 #include "webrtc/api/call/audio_state.h"
 #include "webrtc/base/constructormagic.h"
+#include "webrtc/base/onetimeevent.h"
 #include "webrtc/base/thread_checker.h"
 #include "webrtc/call/bitrate_allocator.h"
 
@@ -63,6 +64,7 @@ class AudioSendStream final : public webrtc::AudioSendStream,
   VoiceEngine* voice_engine() const;
 
   bool SetupSendCodec();
+  void UpdateSmoothedBitrate();
 
   rtc::ThreadChecker thread_checker_;
   rtc::TaskQueue* worker_queue_;
@@ -71,6 +73,7 @@ class AudioSendStream final : public webrtc::AudioSendStream,
   std::unique_ptr<voe::ChannelProxy> channel_proxy_;
 
   BitrateAllocator* const bitrate_allocator_;
+  OneTimeEvent first_update_bitrate_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(AudioSendStream);
 };