message: Save custom parameters provided by the SdpVideoFormat when requesting an encoder switch.
  Cr-Commit-Position: refs/heads/master@{#30541}
diff: @@ -791,13 +791,18 @@ void WebRtcVideoChannel::RequestEncoderSwitch(
  for (const VideoCodecSettings& codec_setting : negotiated_codecs_) {
  if (IsSameCodec(format.name, format.parameters, codec_setting.codec.name,
  codec_setting.codec.params)) {
  - if (send_codec_ == codec_setting) {
  + VideoCodecSettings new_codec_setting = codec_setting;
  + for (const auto& kv : format.parameters) {
  + new_codec_setting.codec.params[kv.first] = kv.second;
  + }
  +
  + if (send_codec_ == new_codec_setting) {
  // Already using this codec, no switch required.
  return;
  }
  ChangedSendParameters params;
  - params.send_codec = codec_setting;
  + params.send_codec = new_codec_setting;
  ApplyChangedParams(params);
  return;
  }
  