GitLab

This is so that the system startup files in /etc/X11/Xsession.d/ are sourced
before running the chosen session.


BUG=139846


Review URL: https://chromiumcodereview.appspot.com/10843011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149288 0039d316-1c4b-4281-b951-d872f2087c98