Servo is a modern, high-performance browser engine designed for both application and embedded use.
Sponsored by Mozilla and written in the new systems programming language Rust, the Servo project aims to achieve better parallelism, security, modularity, and performance.
EDIT seeing Etzos's answer, I see better what you meant (de-facto "standardizing" around electron). positron looks like a better answer then. But long term, there's clear interest from Servo developers, see http://blog.servo.org/2015/05/01/forward/ and Ctrl+F for "Chromium Embedded Framework"