async processContentSteering_(tags) {
    if (!this.playerInterface_ || !this.config_) {
      return;
    }
    let contentSteeringPromise;
    for (const tag of tags) {
      const defaultPathwayId = tag.getAttributeValue('PATHWAY-ID');
      const uri = tag.getAttributeValue('SERVER-URI');
      if (!defaultPathwayId || !uri) {
        continue;
      }
      this.contentSteeringManager_ =
            new shaka.util.ContentSteeringManager(this.playerInterface_);
      this.contentSteeringManager_.configure(this.config_);
      this.contentSteeringManager_.setBaseUris([this.masterPlaylistUri_]);
      this.contentSteeringManager_.setManifestType(
          shaka.media.ManifestParser.HLS);
      this.contentSteeringManager_.setDefaultPathwayId(defaultPathwayId);
      contentSteeringPromise =
          this.contentSteeringManager_.requestInfo(uri);
      break;
    }
    await contentSteeringPromise;
  }
Process EXT-X-CONTENT-STEERING tags.

@param {!Array<!shaka.hls.Tag>} tags
@return {!Promise}
@private