This extension provides a Programmer Dvorak keyboard layout in Chrome OS. How to enable: after installing the extension, head over to chrome://settings/languages then add English(US), and check the "Programmer Dvorak" option. If the option does not show up, sign out once and retry the procedure. Switch keyboard layouts with Alt+Shift until you hit the "Programmer Dvorak" keyboard (symbol: SV*).
Known issue: if this stopped working after updating to M36 please see crbug.com/397143 for a workaround (Chrome OS 37+ should not be affected)