js/polyfills/performance.coffee

istanbul ignore next performance.now polyfill

((root)-> if !root.performance? then root.performance = {}

IE 8

Date.now = Date.now or -> (new Date).getTime() if !root.performance.now? offset = if root.performance?.timing?.navigationStart performance.timing.navigationStart else Date.now() root.performance.now = -> Date.now() - offset )(window)