Merge "Prevent NPE when checking focused stage before root task is ready" into sc-v2-dev

    /** @return {@code true} if this listener contains the currently focused task. */

    boolean isFocused() {

        if (mRootTaskInfo.isFocused) return true;

        if (mRootTaskInfo == null) {

            return false;

        }

        if (mRootTaskInfo.isFocused) {

            return true;

        }

        for (int i = mChildrenTaskInfo.size() - 1; i >= 0; --i) {

            if (mChildrenTaskInfo.valueAt(i).isFocused) return true;

            if (mChildrenTaskInfo.valueAt(i).isFocused) {

                return true;

            }

        }

        return false;

    }