<?php

/**
 * Implements template_preprocess_html().
 */
function my_subtheme_preprocess_html(&$vars) {
  drupal_add_css(
          'http://fonts.googleapis.com/css?family=Old+Standard+TT:400,700', 
          array(
              'type' => 'external',
              'group' => CSS_THEME,
              )
          );
}