Reapply "Support toggling Taskbar All Apps with 3P Launcher." am: 036a83cd99

The revert was not supposed to be auto-merged.

This reverts commit 5a3bf93d82db9ab8d0a03164b953c63c8f5105b0, reversing
changes made to 84f80025866cd5ce569b41e802c37c71c96b8cb0.

Bug: 331384026
Change-Id: Ieb11a8544db90259aae856c4af805c37ce9e68cc
7 files changed