Adjust the hotseat when the bubble bar becomes visible

When the bubble bar becomes visible the space between icons in the
hotseat is now adjusted. This change only does it when the QSB is
above the icons, but this will be changed in the future to be based
on the amount of space between the hotseat and the edge of the screen.

When the hotseat is adjusted, the new width is smaller by the size of
2 icons. The icons are then translated to be evenly spaced within the
boundaries of the new width.

Since the adjustment is only applied when the QSB is above the icons,
it is resized accordingly to the new width.

All visual updates currently snap to the new position, but will be animated
in a follow up.

Demo: https://recall.googleplex.com/projects/3391fc5c-599d-4827-b6f8-d2deb160aa99/sessions/fad1a5c5-e9cf-4586-92e4-1e92df3b002e

Bug: 280494203
Test: Manual (on tangor)
      - Set device to landscape
      - Make the bubble bar visible by adding a bubble
      - Rotate to portrait mode
      - Observe that the hotseat is adjusted
      - Rotate to landscape
      - Observe that the hotseat adjustment is removed
      - Rotate back to portrait
      - Observe that the hotseat is adjusted again
      - Dismiss the bubble to hide he bubble bar
      - Observe the hotseat adjustment is removed

Change-Id: I5b02a60b6cb301ffa2507a6d825c748a782cca18