Added FolderAnimationManager, which manages the opening
and closing animations.
All of the animations are done in the Folder.
ie. When the users taps on the FolderIcon, we immediately hide the
FolderIcon and show the Folder inits place before starting the animation.
Bug: 35064148
Change-Id: Icacdbbf78a25489f2eab4fd352f2c6ed71eb710b
