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Adding a custom themable variable in theme_preprocess_page
function garland_preprocess_page(&$vars) {
  // Move secondary tabs into a separate variable.
  $vars['tabs2'] = array(
   '#theme' => 'menu_local_tasks',
   '#secondary' => $vars['tabs']['#secondary'],
  );

 <snip>

/**
 * Override or insert variables into the page template.
 */
function morin_preprocess_page(&$vars) {
  // add skiplink markup
  $vars['skiplink'] = 'hello world';
 }

<theme name>_preprocess_<template name>

<theme name>_preprocess_html(&$variables)