- An activity always runs on the main looper of the process
and this simplifies threading since all bubble data will
run on the shell thread
- The BubbleExpandedView will not initialize the task view
when mIsOverflow is set. We still snapshot the overflow
view to keep the existing selection animation logic the
same between overflow/task bubbles
Bug: 161979899
Test: atest WMShellUnitTests
Test: atest SytemUITests
Change-Id: If3632a3030c58c9ec334afcb06aac4c51e28938b
ebf6903682