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Is the Chrome source good source code to read? I always find they very organized in the high level, but don't know if its actually good C++ code.

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Yes, it is. Maybe not for the begginer, but Google open source C++ stuff tend to have a great code quality.

Also, the modern open source C++ stuff from Microsoft is also great.

Go for Chrome, V8, Dart, ChakraCore, the C++ part of DotNet VM.

But the only "problem" with them, is that they use their own sort of smart pointers, but if you know that they map 1-1 to smart pointers from std:: when you need to use the std ones, its not a big deal.

Chrome for instance have scoped_ptr = unique_ptr, scoped_refptr = shared_ptr, etc..

Any examples of code bases using these modern features like co-routines? I'd love to see an example of it being used in real code.

Only Microsoft is using co-routines in production code via UWP.

CppCon 2016: Kenny Kerr & James McNellis “Putting Coroutines to Work with the Windows Runtime"

https://www.youtube.com/watch?v=v0SjumbIips

While it doesn't use coroutines that I know of, the Dolphin emulator[1] generally makes good use of modern C++ features.

[1]: https://github.com/dolphin-emu/dolphin

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