lib/Ext/scroll/Scroller.js
function(x, y, animation) {
        var position = this.position;

        x = (typeof x == 'number') ? x + position.x : null;
        y = (typeof y == 'number') ? y + position.y : null;

        return this.scrollTo(x, y, animation);
    }
function(x, y, animation) {
        var position = this.position;

        x = (typeof x == 'number') ? x + position.x : null;
        y = (typeof y == 'number') ? y + position.y : null;

        return this.scrollTo(x, y, animation);
    }
Change the scroll offset by the given amount.
@param {Number} x The offset to scroll by on the x axis.
@param {Number} y The offset to scroll by on the y axis.
@param {Boolean/Object} animation (optional) Whether or not to animate the scrolling to the new position.
@return {Ext.scroll.Scroller} this
@chainable