http://wpsnipp.com/index.php/functions-php/add-custom-media_buttons-for-shortcode-selection/

wp-add-shortcodes.php

add_action('media_buttons','add_sc_select',11);
function add_sc_select(){
    echo '&nbsp;<select id="sc_select">
                        <option>Shortcode</option>
                        <option value="[html][/html]">[html]</option>
                        <option value="[css][/css]">[css]</option>
                        <option value="[javascript][/javascript]">[javascript]</option>
        </select>';
}
add_action('admin_head', 'button_js');
function button_js() {
        echo '<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js" type="text/javascript"></script>
        <script type="text/javascript">
        jQuery(document).ready(function(){
           $("#sc_select").change(function() {$("#content").val($("#content").val()+$("#sc_select :selected").val());})
        });
        </script>';
}