Add Accessibility Menu support for multiple DWB banners

Fix: 341672022
Flag: EXEMPT Bug fix
Test: Manual. With Talkback on, open two apps in split screen and both with DWB enabled, go to Overview, access the Accessibility Menu > Actions.
Change-Id: Iff6adf8d549aa00ea42598cbfbdaf8c7a4164b29
5 files changed