Store background container visibility before lock animation, animate it's visibility on lock/unlock.
Change launcher to animate opacity-only (no size transformations).
Update tests so that handle new cases, and become more readable.
Also contains two lock animation fixes:
1) Shutdown animation now have correct cancel timing (it was tarting actual shutdown too early)
2) Flickering on starting and cancelling lock was removed, and tests were updated.
BUG=162646, 162645
Review URL: https://chromiumcodereview.appspot.com/11453012
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@173461 0039d316-1c4b-4281-b951-d872f2087c98
72e8d4eb6e