experiment w/ using classList to reduce DOM manipulations

js/ext/angular/src/service/angularOverrides.js

@@ -0,0 +1,28 @@
+
+angular.element.prototype.addClass = function(cssClasses) {
+  var x, el, existingClasses;
+  if (cssClasses) {
+    for(x=0; x<this.length; x++) {
+      el = this[x];
+      if(el.setAttribute) {
+
+        if(cssClasses.indexOf(' ') < 0) {
+          el.classList.add(cssClasses)
+        } else {
+          existingClasses = (' ' + (el.getAttribute('class') || '') + ' ')
+                                  .replace(/[\n\t]/g, " ");
+
+          angular.forEach(cssClasses.split(' '), function(cssClass) {
+            cssClass = cssClass.trim();
+            if (existingClasses.indexOf(' ' + cssClass + ' ') === -1) {
+              existingClasses += cssClass + ' ';
+            }
+          });
+
+          el.setAttribute('class', existingClasses.trim());
+        }
+      }
+    }
+  }
+  return this;
+};