Two Taskbar Bug

This cl fixes two taskbar bug being present when invoking CtS.

Solution: simply measure displacement and compare that with slop to animate taksbar background or not.

Test: Presubmit
Bug: 360116669
Flag: EXEMPT Bug Fix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7cada7c46b0462bc56d2dc363d61e8967a42001f)
Merged-In: I7d5a95e1a3729e30e5cf588dcf5b823f3d7de93f
Change-Id: I7d5a95e1a3729e30e5cf588dcf5b823f3d7de93f