Apparently Jack needs this, and my previous testing didn't show it.
Test: build & run image; echo $USER
Change-Id: I66766b230f2f3e0762a49efc9bf2c6212b2b2c4d
If you've upgraded away from Ubuntu 14.04 Trusty, you may find that
older branches (or certain code) doesn't build anymore. These
instructions can form a starting point to build these older branches
within Docker.
Bug: 72993575
Test: Follow instructions, build marshmallow-dev
Test: Follow instructions, build lollipop-mr1-dev
Change-Id: If4047b1bb5324d75a9d0947cb5280ff1cabccb6a