Chromium & Chrome are both based on open-source[1], and the only reason Chromium remains a Blink derivative is that it currently lacks a team[2], so it lacks React Native support.[3]
The B2G Build Guide[4] is a detailed first-hand tutorial with information about mucking around with device image file formats (such as.eng) and what they mean by their values. Basically, if you do know your way around a hex editor 50e0806aeb ralgau

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