Animate the expanded view into the dismiss target

Use MagnetizedObject API to animate the expanded view into the dismiss
circle.
Animate expanded view away together with dismiss circle

Bug: 283991264
Test: drag expanded view into dismiss target, release it
Test: drag expanded view into dismiss target, drag it out
Test: fling expanded view towards dismiss target
Test: fling stuck expanded view out to reset
Change-Id: I7c375d72ce8b9876342cbf8c0e9c9cb5b0042834