@Override
    public void setThemeName(
        @Nonnull
        final HttpServletRequest httpServletRequest,
        final HttpServletResponse httpServletResponse,
        final String s) {
    }
Add resolver to the chain.

@param r the resolver
@return the chaining theme resolver
support/cas-server-support-themes-core/src/main/java/org/apereo/cas/services/web/ChainingThemeResolver.java