Modifies the PipMotionHelper to use PhysicsAnimator for PIP motion.

This implements the Movement portion of the PIP+Bubbles unification proposal (http://go/pip-bubbles-unification#heading=h.rgan76l7680m). Subsequent CLs will add the dismiss and floating content coordination logic.

Test: atest SystemUITests
Bug: 138115889
Change-Id: I90625ae079f47ce9c3b291f958d329a2e9b9ec39
2 files changed