Merge "Add shell command to move activity stacks between displays"

core/java/android/app/ActivityManagerNative.java

core/java/android/app/ActivityView.java

core/java/android/app/IActivityContainer.aidl

core/java/android/app/IActivityManager.java

...re/java/com/android/server/am/ActivityManagerService.java

...va/com/android/server/am/ActivityManagerShellCommand.java

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

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

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

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

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

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