code: function elementClassProp(index, stylingIndex, value) {
      updateClassProp(getStylingContext(index), stylingIndex, value ? true : false);
  }
docs: Add or remove a class in a `classList` on a DOM element.
  
  This instruction is meant to handle the [class.foo]="exp" case
  
  @param index The index of the element to update in the data array
  @param className Name of class to toggle. Because it is going to DOM, this is not subject to
  renaming as part of minification.
  @param value A value indicating if a given class should be added or removed.