In order to support installing and testing custom code on Chrome OS devices, the chromium team is currently adding the ability to easily enable Debugging Features¹ when the device is booted in Developer Mode.

These features will allow enthusiastic developers like you to: 
- Remove rootfs verification² so you can modify OS files
- Enable SSH access to the device using the standard test keys so you can use tools such as cros flash³
- Enable booting from USB so you can install an OS image from a USB drive
- Set both the dev and the system root login password to a custom value so you can manually SSH into the device

Since Debugging features lower system security, you can enable them only during the Out of the Box Experience. 
And if you want to try this now, switch to Dev Channel, powerwash your device, click on the "Enable debugging features" link shown below and follow the instructions¹.

¹ http://www.chromium.org/chromium-os/how-tos-and-troubleshooting/debugging-features
² http://www.chromium.org/chromium-os/poking-around-your-chrome-os-device
³ http://www.chromium.org/chromium-os/build/cros-flash

Source: https://codereview.chromium.org/821473002
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