Add more logging about the bwe state and VideoSendStream state.

webrtc/video/video_send_stream.h

Index: webrtc/video/video_send_stream.h
diff --git a/webrtc/video/video_send_stream.h b/webrtc/video/video_send_stream.h
index 6e2d41c237ed5ca065191ced9f7c9e3a99bb086e..d5ea36398535e935052e936ee0aef29c9c00c98d 100644
--- a/webrtc/video/video_send_stream.h
+++ b/webrtc/video/video_send_stream.h
@@ -139,6 +139,7 @@ class VideoSendStream : public webrtc::VideoSendStream,
   std::unique_ptr<EncoderSettings> pending_encoder_settings_
       GUARDED_BY(encoder_settings_crit_);
   uint32_t encoder_max_bitrate_bps_ GUARDED_BY(encoder_settings_crit_);
+  uint32_t encoder_target_rate_bps_ GUARDED_BY(encoder_settings_crit_);
 
   enum class State {
     kStopped,  // VideoSendStream::Start has not yet been called.