6a74e65953
This makes it more clear which taskbar view is expected for particular code flows. Also makes it easier to set it to null in cleanup(). Test: call cleanup() while taskbarOnHome is invisible, ensure hotseat icons go back to being visible Bug: 182512211 Fixes: 183633496 Change-Id: I680a15582c8034a049b20e035b4d54f5ea5aee04