Make Garden-o-matic at least readable on mobile devices

It still doesn't work very well, but you can at least check the
status of the tree and sorta navigate around.

BUG=354543

Review URL: https://codereview.chromium.org/201853004

git-svn-id: svn://svn.chromium.org/blink/trunk@169710 bbb929c8-8fbe-4397-9dbb-9b2b20218538