[Ozone] Set DPMS to on when starting SSFO

By setting the DPMS property on the connector, the screen will become active
and stay active until the HardwareDisplayController is destroyed.

BUG=

Review URL: https://codereview.chromium.org/33443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230155 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230155