Merge "Updating code due to TaskStackChangeListener changes" into tm-dev

 * Singleton class to load and manage recents model.

 */

@TargetApi(Build.VERSION_CODES.O)

public class RecentsModel extends TaskStackChangeListener implements IconChangeListener {

public class RecentsModel implements IconChangeListener, TaskStackChangeListener {

    // We do not need any synchronization for this variable as its only written on UI thread.

    public static final MainThreadInitializedObject<RecentsModel> INSTANCE =

        @Override

        public void onActivityRotation(int displayId) {

            super.onActivityRotation(displayId);

            // This always gets called before onDisplayInfoChanged() so we know how to process

            // the rotation in that method. This is done to avoid having a race condition between

            // the sensor readings and onDisplayInfoChanged() call