Add the code to create /home/chronos as ordinary source, not generated source
Add the code to create /home/chronos as ordinary source, not generated source

Previously, these command were in an upstart job generated
in customize_rootfs.

Change-Id: Ie1822b8211b2ea738df81ee1c1824c6e2dc32da8

BUG=chromium-os:10976
TEST=install from USB, boot system, and log in as user 'chronos'

Review URL: http://codereview.chromium.org/6305003

joshfire/chromiumos-platform-init