Tell WMShell when bubble bar is active or not active

Use new Bubbles aidl method to tell WMShell when bubble bar is used or
not used.
Allows to better handle cases where taskbar (and bubble bar) get
recreated during rotation.

Bug: 357115534
Test: open an app, expand bubble bar, rotate device, check bubble
  remains expanded
Flag: com.android.wm.shell.enable_bubble_bar
Change-Id: I1c77eecb2b574b3d9b33aadafd1585e1aca26bdb
3 files changed