Notify task about display change when moved to new stack

Bug: 34176283
Test: android.server.cts.ActivityManagerDisplayTests
Test: #testMoveTaskBetweenDisplays
Test: bit FrameworksServicesTests:com.android.server.wm.TaskWindowContainerControllerTests
Test: bit FrameworksServicesTests:com.android.server.wm.TaskStackContainersTests
Change-Id: If085246926790089e014a94093d788805e812489
6 files changed