Are you aware of the fact that Google has search apps on both iOS Appstore and Android Playstore?
If you want to know who is using such apps, look up the reviews on them.
These are not exactly web page search. It need deep integration with account(gmail), maps (with up-to-dateupdated POI), schedules, music, movie reviews, news.
It covered much more than just search. I am not sure google can pull that off the same app in China. It will be very unlikely.