> a team dedicated to the IntelliJ integration was formed around 2015
I don't know which team that was, but to add to that, official support for IntelliJ at Google started quite a bit earlier. I was the second person to join a team writing IntelliJ plugins. We wrote a Blaze plugin not too long after Blaze launched, as it was becoming more popular.
Google tells me that Blaze launched in 2006, so I think it must have been 2007 or 2008.
I don't know which team that was, but to add to that, official support for IntelliJ at Google started quite a bit earlier. I was the second person to join a team writing IntelliJ plugins. We wrote a Blaze plugin not too long after Blaze launched, as it was becoming more popular.
Google tells me that Blaze launched in 2006, so I think it must have been 2007 or 2008.