There is a bulk user import plugin called CSV User Upload. You should be able to export you goolge contact as a csv and uplaod it to this plugin.
You can use my plugin to import google and other contacts http://community.elgg.org/plugins/1541662/1.2/import-address-book
info@elgg.org
Security issues should be reported to security@elgg.org!
©2014 the Elgg Foundation
Elgg is a registered trademark of Thematic Networks.
Cover image by Raül Utrera is used under Creative Commons license.
Icons by Flaticon and FontAwesome.