# File lib/selenium/webdriver/remote/bridge.rb, line 448
        def touchScroll(element, x, y)
          if element
            execute :touchScroll, {}, :xoffset => x, :yoffset => y
          else
            execute :touchScroll, {}, :element => element,
                                      :xoffset => x,
                                      :yoffset => y
          end
        end