Cronet proxy support

[Devraj Mehta]

Hello!

I am looking into creating cronet bindings for node, similar to this project for dart https://github.com/google/cronet.dart, specifically to access Chromium's comprehensive proxy support.

It looks like cronet already includes some proxy support, e.g. it returns whether a proxy server was used to make a request: cronet_url_request.h#79 just no way to input a proxy to use. I assume this means it reads a proxy from some system configuration. I've tested the standard env vars http_proxy, https_proxy, but it doesn't seem to read from those.

I'm trying to figure out if most of chromium's proxy support is already included in the cronet component and just needs some API to enable it. Or if there's more than I realize missing or other dragons here to avoid!

Related issues:

• https://crbug.com/418111
• https://crbug.com/1122749

Thanks!

Devraj