Apply a no-op CSS transformation to the admin toolbar (among other elements) in order to trigger hardware acceleration when focus/DFW deactivates. This helps prevent rendering issues seen in browsers on Retina devices.

See #30516
Props joemcgill


git-svn-id: https://develop.svn.wordpress.org/trunk@30708 602fd350-edb4-49c9-b593-d223f7449a82