nl_tokens: This class scrolls a page from the top to the bottom once . The page is scrolled down by a single scroll gesture .
pl_tokens: function ScrollAction ( opt_callback , opt_distance_func ) { var <mask> = this ; this . beginMeasuringHook = function ( ) { } this . endMeasuringHook = function ( ) { } this . callback_ = opt_callback ; this . distance_func_ = opt_distance_func ; }