How can I add global variable for base layout ?

[Tuong Nguyen]

How can I add global variable for base layout ?
Usually I use View :: composer. Currently with the theme I do not know how?

View::composer(['skins.*'], function ($view) {

            $pagewebsites = PageWebsite::active()->get();

            $view->with('pagewebsites', $pagewebsites);

});

Like that code.
Thank you

[Shipu Ahamed]

Add service provider.