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
Animate circle battery rotation back to 0 after unplugging

After unplugging continue the rotation animation until it's back at 0
instead of jumping to it directly.

Change-Id: Ifea8351d609c0dc4ec82bd459942a197243dd5f1