Merge "Fix notifyTaskDisplayChanged is called every time onDisplayChanged is triggered." into main

    @Override

    void onDisplayChanged(DisplayContent dc) {

        final int lastDisplayId = getDisplayId();

        super.onDisplayChanged(dc);

        if (isLeafTask()) {

            final int displayId = (dc != null) ? dc.getDisplayId() : INVALID_DISPLAY;

            mWmService.mAtmService.getTaskChangeNotificationController().notifyTaskDisplayChanged(

                    mTaskId, displayId);

            //Send the callback when the task reparented to another display.

            if (lastDisplayId != displayId) {

                mWmService.mAtmService.getTaskChangeNotificationController()

                        .notifyTaskDisplayChanged(mTaskId, displayId);

            }

        }

        if (isRootTask()) {

            updateSurfaceBounds();