Google's annual diversity report shows that Asian+ representation in Tech has gone from 38.6% in 2014 to 51.8% in 2018. (Note: this includes both mainland Chinese and other Asians.)

https://diversity.google/annual-report/

In my personal opinion, it has become more common for me to see groups of software engineers informally discuss an issue (say, at someone's desk, or walking down the hallway) entirely in Mandarin instead of English.