+ run tests in a read-only file system
+ change google-chrome data directory from ~/.config/google-chrome
(which is immutable) to /tmp/google-chrome (writable), otherwise
Chrome fails to launch
+ activate new headless mode as the old one will be soon removed
https://developer.chrome.com/docs/chromium/new-headless
Change-Id: I7d183b3f3d2fdc3086a5db5fa62473f777b9eb7a