Google has introduced a so-called new local search experience that allows signed-in users to access the same information on the mobile devices as they had been viewing on the desktop in the past day, via the Recent icon.
Users need to have Web History enabled and be logged into Google when doing their search.
Another theory is that the new feature meant to provide a more unified desktop-mobile experience for users, according to The Next Web.
It is not just Google pursuing this path, The Next Web writes—Mountain Lion also provides the same feature. "I've thoroughly enjoyed using the developer preview of Mountain Lion on my Macbook Air if only because it makes my notes, calendars and chats show up on all of my Apple devices."
More than likely Google has been motivated by both factors, is Search Engine Land's conclusion—plus the usual driving force behind anything Google does. " This is all part of a larger effort on Google's part to capture as much user data as possible and link that data from PC to mobile to have a more holistic view of users and their behaviors."