There are a significant number of committers outside Google, yes. The main part of Chromium that matters here is the content layer and below. The biggest sing

There are a significant number of committers outside Google, yes. The main part of Chromium that matters here is the content layer and below. The biggest single piece of that is Blink, which already uses a governance model with public intent-to-implement/ship notices that anyone can propose or give feedback on. The single largest group of committers are employed by Google, but there have been increasing contributions, including to core function and direction, from external people; for example, Opera folks were key in helping change the memory model in Blink ("Oilpan").