2 Proposals for Minimum Viable InputEvent

Hi,

We had some discussions within the Chrome team (involving individual
platform teams) and some concerns that will block us shipping were raised.

Please see the link to the detailed proposals and reasonings:
https://docs.google.com/document/d/1yPZEkHl_WOPjVeilZjE1XmlyjLCe-uS7THI0SboyrMM/edit?usp=sharing

Thanks,
Chong