add_hooks() public static method

Set up the actions and filters needed for our compatability layer on top of core's Custom CSS implementation.
public static add_hooks ( )
            printf(esc_html__('(modified %s ago)', 'jetpack'), human_time_diff(strtotime($data['post']->post_modified_gmt)));
            ?>
</option>
					<?php 
        }
        ?>
			</select>
			<button class="button" id="other_theme_custom_css_switcher"><?php 
        esc_html_e('Switch', 'jetpack');
        ?>
</button>
		</div>
		<?php 
    }
}
Jetpack_Custom_CSS_Enhancements::add_hooks();
if (!function_exists('safecss_class')) {
    /**
     * Load in the class only when needed.  Makes lighter load by having one less class in memory.
     */
    function safecss_class()
    {
        // Wrapped so we don't need the parent class just to load the plugin.
        if (class_exists('safecss')) {
            return;
        }
        require_once dirname(__FILE__) . '/csstidy/class.csstidy.php';
        /**
         * Class safecss
         */
        class safecss extends csstidy_optimise