Upon realizing that his trip to past Central City means that Eddie Thawne is still alive, the ever-thoughtful Scarlet Speedster decides to get Eddie to record a video message for Iris West. Eddie would, of course, end up sacrificing his own life to stop the threat of Eobard Thawne/Reverse-Flash, and his death is something that still haunts future Iris, as shown earlier in this episode.
For Barry to grab a heartfelt message from Eddie for his BFF was a great gesture and one that encapsulates what the Sultan of Speed is all about.