perf: Send a boost hint when a key on the navbar is pressed

 * A lot of stuff happens, especially when invoking recents.
 * Get ahead of the storm by sending a boost hint before
   kicking off the animations.

Change-Id: I0cecd0c58f8bc8479ea44f63af796500d7b9d7d2
reimplement navbar cursor keys (1/2)

AOSBfied

Change-Id: Iffd8d7f98dc5ec3e5f208821e8eb09723f00b1df
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
NavBar: Fix FC (NPE) on Landscape