code: function resolveVastAdTagURI(vastAdTagUrl, originalUrl) {
    if (!originalUrl) {
      return vastAdTagUrl;
    }
  
    if (vastAdTagUrl.indexOf('//') === 0) {
      var _location = location,
          protocol = _location.protocol;
  
      return '' + protocol + vastAdTagUrl;
    }
  
    if (vastAdTagUrl.indexOf('://') === -1) {
      // Resolve relative URLs (mainly for unit testing)
      var baseURL = originalUrl.slice(0, originalUrl.lastIndexOf('/'));
      return baseURL + '/' + vastAdTagUrl;
    }
  
    return vastAdTagUrl;
  }
docs: Converts relative vastAdTagUri.
  @param  {String} vastAdTagUrl - The url to resolve.
  @param  {String} originalUrl - The original url.
  @return {String}