BubbleData [6/n]: Splice BubbleData into code path

BubbleData internal representation becomes a list in prep
for managing order and grouping internally. Changes are
passed through bubbleData and dispatched for UI updates
via Listener.

Bug: 123542488
Test: atest BubbleControllerTest
Change-Id: I380ca718bc896307b31e73030b4202762a6cf353