Hide all variable options initially and show only those supported by the selected printer. Make option slide in/out animation a bit smoother.

BUG=265999

Review URL: https://codereview.chromium.org/176853008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254255 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254255