- Refactor some code to prevent blocked calls when calling to
and from the Bubbles code when it runs on another thread
- Ensure that ScrimView can be run in separate windows running
on separate threads
Bug: 161979899
Test: atest WMShellUnitTests
Test: atest SystemUITests
Change-Id: I8eca9e9f644486f73a39f21dc37852be51d94539