Smoother folder animation tweaks.

1. Start preview item animations later opening
2. Finish item animations sooner when closing
3. 1 & 2 allow the preview items to move as part of
   the Folder and allows for a smoother animation
4. Remove setCurrentPlayTime as it is O API.

Bug: 36522198
Bug: 35064148
Change-Id: If63d4d032078ff4e28b72a09e35da3a71f1d0e27