public ThemeHandlerInterface::addTheme(Extension $theme)
Adds a theme extension to the internal listing.
\Drupal\Core\Extension\Extension $theme: The theme extension.
public function addTheme(Extension $theme);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Extension!ThemeHandlerInterface.php/function/ThemeHandlerInterface::addTheme/8.1.x