Function addClasses

test/angular/1.5/angular.js:25650–25653

(classes)

        scope.$watch(attr[name], ngClassWatchAction, true);

        function addClasses(classes) {
          var newClasses = digestClassCounts(classes, 1);
          attr.$addClass(newClasses);
        }

        function removeClasses(classes) {
          var newClasses = digestClassCounts(classes, -1);