# File lib/selenium/webdriver/common/touch_screen.rb, line 45
      def scroll(*args)
        case args.size
        when 2
          x, y = args
          @bridge.touchScroll nil, x, y
        when 3
          element, x_offset, y_offset = args
          assert_element element
          @bridge.touchScroll element.ref, Integer(x_offset), Integer(y_offset)
        else
          raise ArgumentError, "wrong number of arguments, expected 2..3, got #{args.size}"
        end
      end