There are many scenarios in which you may be left with a few minutes with no internet. Instead of endlessly refreshing your browser hoping to see the webpage load, Google is offering a more fun option to Chrome users.
What may look like a boring page with a random dinosaur is in fact, a hidden game. Tap the up arrow on your keyboard and the random dinosaur will jump up, and the game will start. All you do is jump over cacti, but it's certainly a lot more fun than hitting F5 forever. Once you regain internet connection I believe the game ends itself and your page loads, otherwise try and raise your high score.
The game is fairly easy after a few tries. Regardless, it's a fun way to pass those few minutes that may seem endless.