Revert "Move bounds calculation and snap fraction to SysUI"

This reverts commit e3ff139062e6aac658ac54f5e11b9d22e540d600.

Reason for revert: PinnedStackTests#testEnterPictureInPictureDiscardSavedPositionOnFinish flaky

Change-Id: I067c94d536b1db94523ef3eec3d443e0dc4cb575
17 files changed