Fix bug where min transmit bitrate wasn't working

webrtc/video/video_send_stream.cc

Index: webrtc/video/video_send_stream.cc
diff --git a/webrtc/video/video_send_stream.cc b/webrtc/video/video_send_stream.cc
index 01c2fc836c7d4a35dde12d1a13b4cd2fbb8e5cf0..4b0ed8b1a5fd8a78c29dbf3890530ecea2120833 100644
--- a/webrtc/video/video_send_stream.cc
+++ b/webrtc/video/video_send_stream.cc
@@ -588,6 +588,16 @@ void VideoSendStream::EncoderProcess() {
       current_encoder_settings_->video_codec.startBitrate = std::max(
           bitrate_allocator_->GetStartBitrate(this) / 1000,
           static_cast<int>(current_encoder_settings_->video_codec.minBitrate));
+
+      if (state_ == State::kStarted) {
+        bitrate_allocator_->AddObserver(
+            this, current_encoder_settings_->video_codec.minBitrate * 1000,
+            current_encoder_settings_->video_codec.maxBitrate * 1000,
+            CalulcateMaxPadBitrateBps(current_encoder_settings_->config,
+                                      config_.suspend_below_min_bitrate),
+            !config_.suspend_below_min_bitrate);
+      }
+
       payload_router_.SetSendStreams(current_encoder_settings_->config.streams);
       vie_encoder_.SetEncoder(current_encoder_settings_->video_codec,
                               payload_router_.MaxPayloadLength());