Send bubble bar bounds in display coordinates to wmshell

Bubble bar can be positioned to the left or right side of the screen.
Instead of sending offsets to wmshell, send the bounds of the bar, in
screen coordinates. WMShell can choose how to use that information.

Flag: LEGACY persist.wm.debug.bubble_bar DEVELOPMENT
Bug: 273310265
Test: repeat with LTR and RTL system languages:
  - have some bubbles, open an app, expand the bubbles by swiping up
    from bubble bar handle
  - have some bubbles, open an app, expand bubble bar by swiping up on
    navbar handle, tap on bubble bar to expand bubbles
  - have some bubbles, be on home screen, tap on bubble bar to expand a
    bubble

Change-Id: Id2d24831e567171b442ae7f34f055b7195a3e060