The Blink team have simply become the new IE style refuseniks, using mobile performance as the standard excuse. Mozilla, Apple and Microsoft have all been creating new "standard" APIs which no one else implements, yet in order to get best performance on their systems you have to use.

If you read the history of that bug someone rightly points out a key thing is MS have to support the pen on surface, and that was as important to MS there as multitouch was to Apple with iOS. Mobile performance is clearly that to the Chrome team, and this mismatch of priorities is what is at the root of the problem.