Prior to this change, the bubble bar controller determined which bubble
to select. With this change, the selection is now determined by the
update received from the shell.
Test: Manual. Tested the add overflow and remove bubble flows, add
bubble and remove overflow flows, and add bubble and remove bubble flows
Flag: com.android.wm.shell.enable_bubble_bar
Fixes: 359952121
Change-Id: I8ec01d6976b1e1cd0129071fd1765041eeb10b83
mpodolian
f62b45e5f0