Do not attach the added recent task to TDA

An empty task was attached to a TaskDisplayArea during
ActivityManager#addAppTask() and the empty task was detected
by tests as a leaked task.

Bug: 177475203
Test: run sample program to invoke ActivityManager#addAppTask()
Change-Id: Ibe09d7f0381705defe2fc82bf11339da2aaa6294

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

@@ -2674,8 +2674,8 @@ public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
                         .setWindowingMode(rootTask.getWindowingMode())
                         .setActivityType(rootTask.getActivityType())
                         .setActivityInfo(ainfo)
-                        .setParent(rootTask.getDisplayArea())
                         .setIntent(intent)
+                        .setTaskId(rootTask.getDisplayArea().getNextRootTaskId())
                         .build();
 
                 if (!mRecentTasks.addToBottom(task)) {

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

@@ -7181,6 +7181,7 @@ class Task extends WindowContainer<WindowContainer> {
                     + " mode=" + windowingModeToString(getWindowingMode()));
             pw.println("  isSleeping=" + shouldSleepActivities());
             pw.println("  mBounds=" + getRequestedOverrideBounds());
+            pw.println("  mCreatedByOrganizer=" + mCreatedByOrganizer);
         };
 
         boolean printed = false;