Add deskId to DesktopTask.

Now that `GroupedTaskInfo` propagates the `deskId` from
Shell (see ag/31825217), we need to plumb this value in
Launcher through `DesktopTask`.

Future CLs will use this value in Overview.

Bug: 395911284
Test: m, modified existing tests.
Flag: com.android.window.flags.enable_multiple_desktops_frontend
Flag: com.android.window.flags.enable_multiple_desktops_backend
Change-Id: I396250e0cac761c4c5f7e8b2d6cddbe68e646217

quickstep/src/com/android/quickstep/views/RecentsView.java

@@ -3044,8 +3044,12 @@ public abstract class RecentsView<
             // Add an empty view for now until the task plan is loaded and applied
             final TaskView taskView;
             if (needDesktopTask) {
+                final int activeDeskId =
+                        DesktopVisibilityController.INSTANCE.get(mContext).getActiveDeskId(
+                                mContainer.getDisplay().getDisplayId());
                 taskView = getTaskViewFromPool(TaskViewType.DESKTOP);
-                ((DesktopTaskView) taskView).bind(new DesktopTask(Arrays.asList(runningTasks)),
+                ((DesktopTaskView) taskView).bind(
+                        new DesktopTask(activeDeskId, Arrays.asList(runningTasks)),
                         mOrientationState, mTaskOverlayFactory);
             } else if (needGroupTaskView) {
                 taskView = getTaskViewFromPool(TaskViewType.GROUPED);