Lighthouse: Support remote debug devices within DevTools

[itchina110]

If I use chrome://inspect/ remote debug my android chrome，lighthouse can not run

if remote debug my android other browser,can not find lighthouse

[paulirish]

Currently we don't support using Lighthouse via devtools while remote debugging.

However, you can use the Lighthouse CLI against a remote debug mobile device. Here are the docs for that: https://github.com/GoogleChrome/lighthouse/blob/master/docs/readme.md#testing-on-a-mobile-device

• [ ] We should change the text

[connorjclark]

Remote debugging Audits does work today. I tested with 78.0.3904.90. Notably, Chrome 76 had some emulation issues, which we fixed with #9377.

I didn't expect anything to be broken, since the connection layer is completely abstracted from the rest of the DevTools frontend, such that I don't see what would need to be done to enable remote debugging support. It seems free.