Move task to top in window manager.

In certain situations it was possible for a task to move to the top
in activity manager but not in window manager. This resulted in
the task appearing behind the launcher icons.

Fixes bug 13410184.

Change-Id: If0582b395e126a8aff70a0e4c64b731083c6ae8a

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

@@ -1709,6 +1709,7 @@ public final class ActivityStackSupervisor {
             TaskRecord sourceTask = sourceRecord.task;
             targetStack = sourceTask.stack;
             moveHomeStack(targetStack.isHomeStack());
+            mWindowManager.moveTaskToTop(sourceTask.taskId);
             if (!addingToTask &&
                     (launchFlags&Intent.FLAG_ACTIVITY_CLEAR_TOP) != 0) {
                 // In this case, we are adding the activity to an existing
@@ -1767,6 +1768,7 @@ public final class ActivityStackSupervisor {
             r.setTask(prev != null ? prev.task
                     : targetStack.createTaskRecord(getNextTaskId(), r.info, intent, true),
                     null, true);
+            mWindowManager.moveTaskToTop(r.task.taskId);
             if (DEBUG_TASKS) Slog.v(TAG, "Starting new activity " + r
                     + " in new guessed " + r.task);
         }