Add page-views and page-panels body classes

One thing that is difficult to determine at the page.tpl level is if the $content was generated from a Views or Panels page.

Ken Rickard showed me how you can inspect the menu item returned by menu_get_item() to see if the page is a Views page.

$menu_item = menu_get_item();
if ($menu_item['page_callback'] == 'views_page')) {
  // The current page is a Views page.
}

A little more digging and I realized I could use the same technique to tell if the page is a Panels page.

Awesome! I had been looking for an easy way to know these things, but never found it.