Polish app => recents animation (5/5)

Add the part of the animation where task views fade in from bottom to
top. For the app animating in, we only fade in the label and the icon as
the snapshot needs to be visible as the app window scales down to it.

Bug: 132112131
Test: Manual test animation
Change-Id: Ia3fb98fde0b14fa4f72b53a1941cc2ee6b9f2294