Content recording relies upon a class describing current state.
rather than passing around details from media > display > wm.
WMService keeps track of the session in ContentRecordingController.
ContentRecordingController manages hand-off between different
DisplayContent instances, as the session details are changed.
Manually tested that fold/unfold handling when screen recording
from QS tile still works, and that taking over a screen cast
with a screen recording works.
Refactoring logic from DisplayContent into new recording
delegate will come in a future change.
Bug: 216756854
Test: atest FrameworksCoreTests:ContentRecordingSessionTest
Test: atest WmTests:DisplayContentTests
Test: atest WmTests:ContentRecordingControllerTests
Change-Id: Ib4f125dd703d362ac13fcbe469d00b345827e706
27655e1fc3