Cross Reference: /external/chromium_org/chrome/browser/resources/chromeos/sounds/earcons

`Name`	`Date`	`Size`
Up to higher level directory
`enter_screen.wav`	10-Mar-2015	`100.2K`
`exit_screen.wav`	10-Mar-2015	`86.2K`
`passthrough.wav`	10-Mar-2015	`86.2K`