Having a shared electron runtime on each platform is an answer to some of its performance-related criticisms. Hopefully this is what Microsoft are going for with chromium and the github acquisition. There would still need to be compatible equivalents on Mac and Linux however, or it would render the endeavour pointless.
Given that electron is not chrome, no, not chrome. A specially made, backwards compatible chromium/node/whatever bundle, that developers can build against without fear of having their apps broken by future API changes.
