[VRR] Fix the scrolling not work in Contacts issue

Fix the scrolling not work in Contacts issue. If a View is an instance
of OverlayViewGroup, wet get the velocity from its hostView.

Flag: EXEMPT bugfix
Fix: 359945544
Test: atest ViewRootImplTest / atest ViewFrameRateTest
Change-Id: I131a5ecd5aba4c6684bb56554e2af7bfb87ff2b3