Move some window related files to android.window package

Window management files on the client side have normally been dumped in
either android.view or android.app package. This CL starts to
centralized them in android.window package so there is better
separation.

Test: they pass
Bug: 147406652
Bug: 152113464
Bug: 152117221
Change-Id: I4d64bd256e9b3581af0ccf9396f7dd2454132719
diff --git a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
index 890b945..1844395 100644
--- a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@@ -144,7 +144,7 @@
 import android.app.IAssistDataReceiver;
 import android.app.INotificationManager;
 import android.app.IRequestFinishCallback;
-import android.app.ITaskOrganizerController;
+import android.window.ITaskOrganizerController;
 import android.app.ITaskStackListener;
 import android.app.Notification;
 import android.app.NotificationManager;
@@ -230,7 +230,7 @@
 import android.view.IRecentsAnimationRunner;
 import android.view.RemoteAnimationAdapter;
 import android.view.RemoteAnimationDefinition;
-import android.view.WindowContainerTransaction;
+import android.window.WindowContainerTransaction;
 import android.view.WindowManager;
 
 import com.android.internal.R;