Move panels classes to ash/wm/panels and add OWNERS.

BUG=None


Review URL: https://chromiumcodereview.appspot.com/12476020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186764 0039d316-1c4b-4281-b951-d872f2087c98
14 files changed