By adding Switch controller support to Chrome, it would most likely allow users to play with their pre-existing gaming accessories. We will likely learn the answer to this question and more at GDC.

A change to Chromium, which serves as the foundations of Chrome and Chrome OS, improves support for the Nintendo Switch controllers, both the Switch Pro as well as the Joy-Cons.

Google（グーグル）のChromeブラウザが、Nintendo Switch（ニンテンドースイッチ）のコントローラーに今後対応することが判明しましたよ。

Gaming Why is Google adding Nintendo controller support to Chrome? March 14, 2019 - 10:28 pm Google is apparently working to improve native support for Nintendo’s Switch controllers within Chrome.

Like with most things Google does, it's about showing off something bigger. In this case, it's a quick sync from your computer to phone on the same network to use your mobile as a game controller.