Binded 'aria-disabled' for selection-list.ts

Author: sllethe

src/lib/list/selection-list.ts

@@ -39,7 +39,8 @@ import {MdListOption} from './list-option';
     '[attr.tabindex]': '_tabIndex',
     'class': 'mat-selection-list',
     '(focus)': 'focus()',
-    '(keydown)': 'keydown($event)'},
+    '(keydown)': 'keydown($event)',
+    '[attr.aria-disabled]': 'disabled.toString()'},
   template: '<ng-content></ng-content>',
   styleUrls: ['list.css'],
   encapsulation: ViewEncapsulation.None,