While some of the searching to arrange the reunion is handled from a desktop, some of it is achieved using the aforementioned Nexus handsets. Some of the video is designed to show you how specific Google searches can be, such as when the granddaughter types in "park with ancient gate in lahore" to reference something her granddad had said about his long time best friend.
Well, we don't want to spoil the end of this tear-jerker but as you probably figured out by now the two friends are reunited thanks to Google, with the Nexus 4 doing yeoman's work behind the scenes. And don't tell us that you weren't emotionally invested in the video. We could see that tear coming from your eye.