platform_ExternalUsbPeripherals gets runs frequently on a subset of devices according to stainless,

https://stainless.corp.google.com/search?col=build&exclude_non_release=true&exclude_cts=true&suite=%5Eusb%5C_detect%24&row=test&view=matrix&first_date=2018-09-13&last_date=2018-09-19

and looks to manipulate the USB & lid via servo without deps on other things like chameleon, wificell, audio loopback dongle.

Might be a simple one to start with.

On impact, it would definitely be the FAFT stuff (inheriting FirmwareTest base class).

We started writing more power autotest using servod now... since servo is not supported in tast just yet, the new tests are in python.

Personally I would like to see tast starting supporting servod. 

I imagine this requires writing a servo client in Go to talk to servod, and a ton of other helper functions (key presses, etc.)

I think that hidehiko@ spent a bit of time looking at this, but I'm not sure about what the plan for implementing it looks like.

The focus for Q4 is porting tests that are part of the CQ, so I don't know that this will happen this quarter unless it's simple to do (unless someone else has time to work on it).

//src/third_party/hdctools/servo/README.md looks like it has some good information.