Wrap BubbleBarLocation and UpdateSource in an object

This CL introduces an object that wraps the location and the update
source to simplify an API that takes an optional location update
request.

Bug: 407475117
Flag: com.android.wm.shell.enable_create_any_bubble
Test: builds
Change-Id: I0d5c85839415f2b37fc9dcbbe0bca905dc9ffa4d