Reapply "Support toggling Taskbar All Apps with 3P Launcher." am: 036a83cd
The revert was not supposed to be auto-merged.
This reverts commit 5a3bf93d, reversing
changes made to 84f80025.
Bug: 331384026
Change-Id: Ieb11a8544db90259aae856c4af805c37ce9e68cc