Add tpl based on delta name.

preprocess_page_add_template_based_on_delta_name.php

function yourtheme_preprocess_page(&$vars) {
  $contexts = context_active_contexts();

  // Add delta based tpl.
  foreach ($contexts as $context) {
    if (isset($context->reactions['delta']) && ($delta_name = $context->reactions['delta']['delta_template'])) {
      $vars['theme_hook_suggestions'][] = 'page__'. $delta_name;
    }
  }
}