Added FloatingAppBarScrollingViewBehavior

-Added FloatingAppBarScrollingViewBehavior for search bar. It can be scolling,
 transparent and overlapped the scrolling child view.
-Exchanged the position of NestedScrollView and AppBarLayout in
 settings_homepage_container.xml.
-Set the app bar height.

Change-Id: I6ef4c9001a1f893292fcbc825a0a9f2069b7286b
Fixes: 118886724
Test: robotest