[roca]

Actually a commitment to Web standards does mean a commitment to not launching nonstandard extensions to the Web platform, usually. Many of Chrome's own Web standards people would tell you this. For PNaCl and some other features Google's official excuse was to designate them "not part of the Web platform" ... which doesn't really make sense from anyone's point of view other than Google's.

In this case, the desirability and feasibility of running C/C++ code on the Web was not something that needed to be demonstrated by enabling PNaCl for Web content. In fact, uptake of Web-PNaCl has been extremely low --- fortunately. If significant Web-PNaCl uptake had been a prerequisite for WebAssembly, then WebAssembly probably wouldn't have happened!