Google recently wrote an official blogpost on the Webmaster Central Blog, which is to encourage webmasters to adopt and thus implement autocomplete on web forms for your mobile sites.
Google’s Mathieu Perreault from the Chrome team and Zineb Ait Bahajji from the Webmaster Trends team said:
“Making websites friendly and easy to browse for users on mobile devices is very important. We hope to see many forms marked up with the “autocomplete” attribute in the future.”
For any questions, you can post it in their Webmasters Help Forums.Google Encouraging Webmasters To Auto-complete Web Forms For Mobile!,