Fix automatic show/hide of FAB

As we no longer reposition GONE views to their anchors
(If9ac02024782d799645e3e5537e46d487ecb6e52), we have to use INVISIBLE
for automatic FAB show/hide because it needs to be notified of anchor
changes.

Test: BottomSheetBehaviorTest#testFabVisibility,
AppBarWithCollapsingToolbarTest#testPinnedToolbarAndAnchoredFab, and
FloatingActionButtonTest pass on API 9, 15, 25
Bug: 32421388
Change-Id: Ie503991c28246dc7cb942c88daf4d91a9a3ee3d1
3 files changed