Merge "Move policy handling into ATM hierarchy [1/n]"

...ices/core/java/com/android/server/wm/ActivityDisplay.java

services/core/java/com/android/server/wm/ActivityStack.java

...e/java/com/android/server/wm/ActivityStackSupervisor.java

...ava/com/android/server/wm/ActivityTaskManagerService.java

services/core/java/com/android/server/wm/DisplayContent.java

...a/com/android/server/wm/DockedStackDividerController.java

...ava/com/android/server/wm/RecentsAnimationController.java

.../core/java/com/android/server/wm/RootWindowContainer.java

...ore/java/com/android/server/wm/StackWindowController.java

services/core/java/com/android/server/wm/TaskRecord.java

services/core/java/com/android/server/wm/TaskStack.java

...stests/src/com/android/server/wm/DisplayContentTests.java

...tests/src/com/android/server/wm/ActivityDisplayTests.java

.../wmtests/src/com/android/server/wm/ActivityTestsBase.java

...ts/wmtests/src/com/android/server/wm/WindowTestUtils.java